11.1 KEY CONCEPT A population shares a common gene pool.

Size: px
Start display at page:

Download "11.1 KEY CONCEPT A population shares a common gene pool."

Transcription

1 11.1 KEY CONCEPT A population shares a common gene pool.

2 Why it s beneficial: Genetic variation leads to phenotypic variation. It increases the chance that some individuals will survive Phenotypic variation is necessary for natural selection.

3 How it s stored in a population Genetic variation is stored in a population s gene pool. made up of all alleles in a population Different allele combinations form when organisms have offspring

4 How it s measured: Allele frequencies measure genetic variation. measures how common an allele is in population can be calculated for each allele in gene pool

5 Genetic variation comes from two main sources. Mutation is a random change in the DNA of a gene. can form new allele can be passed on to offspring if in reproductive cells Recombination forms new combinations of alleles. usually occurs during meiosis parents alleles arranged in new ways in gametes

6 Genetic variation comes from several sources. Hybridization is the crossing of two different species. occurs when individuals can t find mate of own species topic of current scientific research

7

8 11.2 KEY CONCEPT Populations, not individuals, evolve.

9 Natural selection acts on distributions of traits. A normal distribution graphs as a bell-shaped curve. highest frequency near mean value frequencies decrease toward each extreme value A population follows a normal distribution when: that population is not under natural selection for the trait Draw this in your notes

10 Natural selection can change the distribution of a trait in one of three ways. This is called microevolution. It is evolution within a population. There is an observable change in the allele frequencies over time can result from natural selection

11 Natural selection can take one of three paths. Directional selection favors phenotypes at one extreme. Example: drug-resistance in bacteria Draw the solid line in your notes

12 Stabilizing selection favors the intermediate phenotype. Example: size of gall flies Draw the solid line in your notes

13 Disruptive selection favors both extreme phenotypes. Example: body color in bunting birds Draw the solid line in your notes

14 11.3 KEY CONCEPT Natural selection is not the only mechanism through which populations evolve.

15 Gene flow Definition: movement of alleles between populations. How it works: When animals migrate from one population to another and breed in the new population. immigration & emigration Lots of gene between populations keeps populations (genetically) similar. Limited gene flow results in Genetically different populations that could evolve into diff species

16 Genetic drift Definition: change in allele frequencies due to chance. How it works: causes a loss of genetic diversity and is most common in small populations. Key Terms: Bottleneck Effect occurs when an event drastically reduces population size.

17 Founder effect It occurs when a few individuals start a new population. The founder effect is genetic drift that occurs after the start of new population.

18 Genetic drift has negative effects on a population. some individuals can t adapt harmful alleles can become more common due to chance

19 Sexual selection Definition: occurs when certain traits increase mating success. How it works: Sexual selection occurs due to higher cost of reproduction for females. females are more limited in potential offspring each cycle males produce many sperm continuously Females preferentially mate with males that display certain traits

20 There are two types of sexual selection. intrasexual selection: competition among males for a female intersexual selection: males display certain traits to attract females

21

22 11. 5 KEY CONCEPT New species can arise when populations are isolated.

23 The isolation of populations can lead to speciation. Populations become isolated when there is no gene flow. Isolated populations adapt to their own environments. Genetic differences can add up over generations.

24 Reproductive isolation can occur between isolated populations. members of different populations cannot mate successfully final step to becoming separate species Speciation is the rise of two or more species from one existing species.

25

26 Populations can become isolated in several ways. 1. Behavioral barriers can cause isolation. called behavioral isolation includes differences in courtship or mating behaviors

27 2. Geographic barriers can cause isolation. called geographic isolation physical barriers like mountains and rivers divide population

28

29 3. Temporal barriers can cause isolation. called temporal isolation timing of reproductive periods prevents mating

30 11.6 KEY CONCEPT Evolution occurs in patterns.

31 Evolution through natural selection is not random. Natural selection can have direction. The effects of natural selection add up over time.

32 Convergent evolution describes evolution toward similar traits in unrelated species.

33

34 Divergent evolution describes evolution toward different traits in closely related species. red fox Kit fox ancestor How do convergent and divergent evolution illustrate the directional nature of natural selection?

35

36 LE 24-6 A. harrisi A. leucurus

37 Species can shape each other over time. When two or more species evolve together, this is called coevolution. evolutionary paths become connected species evolve in response to changes in each other

38 Coevolution can occur in beneficial relationships. Both species receive benefits from the other as a result of adaptations that each species evolved over many generations The ant lives inside hollow thorns and protects the acacia by stinging any potential predators

39 Coevolution can occur in competitive relationships, sometimes called evolutionary arms races. Both species respond to competitive pressure from the other through adaptations over many generations

40 Species can become extinct. Extinction is the elimination of a species from Earth. Background extinctions occur randomly but at a very low rate. usually affects a few species in a small area caused by local changes in environment

41 Mass extinctions are rare but much more intense. destroy many species at global level thought to be caused by catastrophic events like earthquakes, volcanic eruptions, etc. at least five mass extinctions in last 600 million years

42 Speciation often occurs in patterns. A pattern of punctuated equilibrium exists in the fossil record. theory proposed by Eldredge and Gould in 1972 episodes of speciation occur suddenly in geologic time followed by long periods of little evolutionary change revised Darwin s idea that species arose through gradual transformations

43 Many species evolve from one species during adaptive radiation. ancestral species diversifies into many descendent species descendent species usually adapted to wide range of environments

11.1. A population shares a common gene pool. The Evolution of Populations CHAPTER 11. Fill in the concept map below.

11.1. A population shares a common gene pool. The Evolution of Populations CHAPTER 11. Fill in the concept map below. 11.1 GENETIC VARIATION WITHIN POPULATIONS Study Guide KEY CONCEPT A population shares a common gene pool. VOCABULARY gene pool allele frequency MAIN IDEA: Genetic variation in a population increases the

More information

9.1: Mechanisms of Evolution and Their Effect on Populations pg. 350-359

9.1: Mechanisms of Evolution and Their Effect on Populations pg. 350-359 9.1: Mechanisms of Evolution and Their Effect on Populations pg. 350-359 Key Terms: gene flow, non-random mating, genetic drift, founder effect, bottleneck effect, stabilizing selection, directional selection

More information

Microevolution: The mechanism of evolution

Microevolution: The mechanism of evolution Microevolution: The mechanism of evolution What is it that evolves? Not individual organisms Populations are the smallest units that evolve Population: members of a species (interbreeding individuals and

More information

Biology 1406 - Notes for exam 5 - Population genetics Ch 13, 14, 15

Biology 1406 - Notes for exam 5 - Population genetics Ch 13, 14, 15 Biology 1406 - Notes for exam 5 - Population genetics Ch 13, 14, 15 Species - group of individuals that are capable of interbreeding and producing fertile offspring; genetically similar 13.7, 14.2 Population

More information

Evolution and Darwin

Evolution and Darwin Evolution and Darwin Evolution The processes that have transformed life on earth from it s earliest forms to the vast diversity that characterizes it today. A change in the genes!!!!!!!! Old Theories of

More information

How do populations evolve?... Are there any trends?...

How do populations evolve?... Are there any trends?... How do populations evolve?... Are there any trends?... Gene pool: all of the genes of a population Allele frequency: the percentage of any particular allele in a gene pool A population in which an allele

More information

Evolution Part 1. Unit 10 Miss Wheeler

Evolution Part 1. Unit 10 Miss Wheeler Evolution Part 1 Unit 10 Miss Wheeler Evolution Evolution- The process by which organisms have changed (and will continue changing) over time Charles Darwin- Father of Evolution Traveled for 5 years on

More information

Summary. 16 1 Genes and Variation. 16 2 Evolution as Genetic Change. Name Class Date

Summary. 16 1 Genes and Variation. 16 2 Evolution as Genetic Change. Name Class Date Chapter 16 Summary Evolution of Populations 16 1 Genes and Variation Darwin s original ideas can now be understood in genetic terms. Beginning with variation, we now know that traits are controlled by

More information

Ch. 13 How Populations Evolve Period. 4. Describe Lamarck s proposed theory of evolution, The Theory of Acquired Traits.

Ch. 13 How Populations Evolve Period. 4. Describe Lamarck s proposed theory of evolution, The Theory of Acquired Traits. Ch. 13 How Populations Evolve Name Period California State Standards covered by this chapter: Evolution 7. The frequency of an allele in a gene pool of a population depends on many factors and may be stable

More information

Population Genetics and Evolution - Practice

Population Genetics and Evolution - Practice Name: Period: Date: Population Genetics and Evolution - Practice Multiple Choice Identify the choice that best completes the statement or answers the question. Indicate your answer choice with an UPPER

More information

Ch.16-17 Review. Name: Class: Date: Multiple Choice Identify the choice that best completes the statement or answers the question.

Ch.16-17 Review. Name: Class: Date: Multiple Choice Identify the choice that best completes the statement or answers the question. Name: Class: Date: Ch.16-17 Review Multiple Choice Identify the choice that best completes the statement or answers the question. 1. Which of the following statements describe what all members of a population

More information

Evolution of Populations

Evolution of Populations Evolution of Populations Evolution Q: How can populations evolve to form new species? 17.1 How do genes make evolution possible? WHAT I KNOW SAMPLE ANSWER: There are different variations of the same gene.

More information

CH. 15: Darwin s Theory of Evolution. Directions: READ ch. 15 in your textbook and use the note outline to help you answer the questions below.

CH. 15: Darwin s Theory of Evolution. Directions: READ ch. 15 in your textbook and use the note outline to help you answer the questions below. CH. 15: Darwin s Theory of Evolution Directions: READ ch. 15 in your textbook and use the note outline to help you answer the questions below. 1. What is a theory? 2. Describe some of the ideas that influenced

More information

Theories of Evolution: A Brief History (take notes from classmates presentations)

Theories of Evolution: A Brief History (take notes from classmates presentations) Packet Theories of : A Brief History (take notes from classmates presentations) Carl Linnaeus (1707-1778) William Paley (1743-1805) Georges Cuvier (1769-1832) Thomas Malthus (1766-1834) Jean Baptiste Lamarck

More information

Quiz #4 Ch. 4 Modern Evolutionary Theory

Quiz #4 Ch. 4 Modern Evolutionary Theory Physical Anthropology Summer 2014 Dr. Leanna Wolfe Quiz #4 Ch. 4 Modern Evolutionary Theory 1. T/F Evolution by natural selection works directly on individuals, transforming populations. 2. T/F A genotypic

More information

How Populations Evolve

How Populations Evolve How Populations Evolve Darwin and the Origin of the Species Charles Darwin published On the Origin of Species by Means of Natural Selection, November 24, 1859. Darwin presented two main concepts: Life

More information

Copyright 2011 Pearson Education, Inc.

Copyright 2011 Pearson Education, Inc. Genetic Composition of Populations Five factors alter allele frequencies and bring about evolutionary change Genetic drift Gene flow Mutations Sexual selection Natural selection Very large population No

More information

Section Review 15-1 1.

Section Review 15-1 1. Section Review 15-1 1. Beagle 2. theory of evolution 3. varied 4. Darwin s curiosity might have led him to make many observations and ask questions about the natural world. His analytical nature may have

More information

Chapter 16 How Populations Evolve

Chapter 16 How Populations Evolve Title Chapter 16 How Populations Evolve Copyright The McGraw-Hill Companies, Inc. Permission required for reproduction or display. Population Genetics A population is all of the members of a single species

More information

Population Genetics (Outline)

Population Genetics (Outline) Population Genetics (Outline) Definition of terms of population genetics: population, species, gene, pool, gene flow Calculation of genotypic of homozygous dominant, recessive, or heterozygous individuals,

More information

Population Genetics: Changes in the Gene Pool and Gene Frequency

Population Genetics: Changes in the Gene Pool and Gene Frequency Biology 11 Name: Population Genetics: Changes in the Gene Pool and Gene Frequency Evolution through natural selection describes how populations change over time but it is not the only way that populations

More information

Chapter 21 Active Reading Guide The Evolution of Populations

Chapter 21 Active Reading Guide The Evolution of Populations Name: Roksana Korbi AP Biology Chapter 21 Active Reading Guide The Evolution of Populations This chapter begins with the idea that we focused on as we closed Chapter 19: Individuals do not evolve! Populations

More information

The Origin of Species. Chapter 16

The Origin of Species. Chapter 16 The Origin of Species Chapter 16 Species Species is defined as a group of actually or potentially interbreeding natural populations, which are reproductively isolated from other such groups (biological

More information

Principles of Evolution - Origin of Species

Principles of Evolution - Origin of Species Theories of Organic Evolution X Multiple Centers of Creation (de Buffon) developed the concept of "centers of creation throughout the world organisms had arisen, which other species had evolved from X

More information

Population Genetics. Outline. Key Concepts: How does a population evolve?

Population Genetics. Outline. Key Concepts: How does a population evolve? Population Genetics How does a population evolve? Outline 1. Key Concepts 2. Individuals Don t evolve, Populations Do 3. The Hardy-Weinberg Theorem 4. The Microevolution and Natural Selection 5. Genetic

More information

Chapter 25: Population Genetics

Chapter 25: Population Genetics Chapter 25: Population Genetics Student Learning Objectives Upon completion of this chapter you should be able to: 1. Understand the concept of a population and polymorphism in populations. 2. Apply the

More information

Allele Frequencies: Changing. Chapter 15

Allele Frequencies: Changing. Chapter 15 Allele Frequencies: Changing Chapter 15 Changing Allele Frequencies 1. Mutation introduces new alleles into population 2. Natural Selection specific alleles are more likely to be passed down because they

More information

Evolution (18%) 11 Items Sample Test Prep Questions

Evolution (18%) 11 Items Sample Test Prep Questions Evolution (18%) 11 Items Sample Test Prep Questions Grade 7 (Evolution) 3.a Students know both genetic variation and environmental factors are causes of evolution and diversity of organisms. (pg. 109 Science

More information

Wilmot Evolution Review

Wilmot Evolution Review Wilmot Evolution Review Name- 1. Define species- group of organisms that can interbreed and produce fertile offspring 2. What was Jean Baptiste de Lamark s contribution to evolution? Theory of Acquired

More information

Lecture 10 Friday, March 20, 2009

Lecture 10 Friday, March 20, 2009 Lecture 10 Friday, March 20, 2009 Reproductive isolating mechanisms Prezygotic barriers: Anything that prevents mating and fertilization is a prezygotic mechanism. Habitat isolation, behavioral isolation,

More information

CAMPBELL BIOLOGY. Chapter 13

CAMPBELL BIOLOGY. Chapter 13 Lecture 10 Population Genetics CAMPBELL BIOLOGY Chapter 13 Hox Genes Control development Hox genes need to be highly regulated to get expressed at the right time and correct level to orchestrate mammalian

More information

Chapter 8 Population Genetics: How do Genes Move through Time and Space?

Chapter 8 Population Genetics: How do Genes Move through Time and Space? Chapter 8 Population Genetics: How do Genes Move through Time and Space? 4/29/2009 Chun-Yu Chuang How Do We Characterize Variation? Variation can be smooth or discontinuous. Two views of biology Naturalists

More information

Practice Questions 1: Evolution

Practice Questions 1: Evolution Practice Questions 1: Evolution 1. Which concept is best illustrated in the flowchart below? A. natural selection B. genetic manipulation C. dynamic equilibrium D. material cycles 2. The diagram below

More information

Chapter 10. The Theory of Evolution Worksheets. (Opening image copyright Daniel Korzeniewski, Used under license from Shutterstock.com.

Chapter 10. The Theory of Evolution Worksheets. (Opening image copyright Daniel Korzeniewski, Used under license from Shutterstock.com. Chapter 10 The Theory of Evolution Worksheets (Opening image copyright Daniel Korzeniewski, 2010. Used under license from Shutterstock.com.) Lesson 10.1: Darwin and the Theory of Evolution Lesson 10.2:

More information

Activity 2.4 Text:Campbell,v.8,chapter24 SPECIATION SPECIES BIOLOGICAL CONCEPT REPRODUCTIVE BARRIERS PREZYGOTIC: Evolution Activity 2.

Activity 2.4 Text:Campbell,v.8,chapter24 SPECIATION SPECIES BIOLOGICAL CONCEPT REPRODUCTIVE BARRIERS PREZYGOTIC: Evolution Activity 2. AP BIOLOGY Activity 2.4 Text:Campbell,v.8,chapter24 NAME DATE HOUR SPECIATION SPECIATION SPECIES BIOLOGICAL CONCEPT REPRODUCTIVE BARRIERS PREZYGOTIC: Evolution Activity 2.4 page 1 POSTZYGOTIC: MODES OF

More information

What two Assumptions did Darwin have to arrive at BEFORE he could form his theories of evolution?

What two Assumptions did Darwin have to arrive at BEFORE he could form his theories of evolution? Influences on Darwin s Thinking: What ideas did each of the listed names below contribute to Darwin s thinking about evolution? (very brief) Georges Buffon: Jean Baptiste Lamarck: Charles Lyell: Thomas

More information

C1. A gene pool is all of the genes present in a particular population. Each type of gene within a gene pool may exist in one or more alleles.

C1. A gene pool is all of the genes present in a particular population. Each type of gene within a gene pool may exist in one or more alleles. C1. A gene pool is all of the genes present in a particular population. Each type of gene within a gene pool may exist in one or more alleles. The prevalence of an allele within the gene pool is described

More information

Assessment Schedule 2014 Biology: Demonstrate understanding of genetic variation and change (91157) Evidence Statement

Assessment Schedule 2014 Biology: Demonstrate understanding of genetic variation and change (91157) Evidence Statement NCEA Level 2 Biology (91157) 2014 page 1 of 5 Assessment Schedule 2014 Biology: Demonstrate understanding of genetic variation and change (91157) Evidence Statement NCEA Level 2 Biology (91157) 2014 page

More information

Speciation factsheet. What is a species?

Speciation factsheet. What is a species? What is a species? A species is a group of interbreeding individuals that share a gene pool and are reproductively isolated from other species. It is impossible to determine whether two organisms are from

More information

CHAPTER 23 THE EVOLUTIONS OF POPULATIONS. Section B: Causes of Microevolution

CHAPTER 23 THE EVOLUTIONS OF POPULATIONS. Section B: Causes of Microevolution CHAPTER 23 THE EVOLUTIONS OF POPULATIONS Section B: Causes of Microevolution 1. Microevolution is generation-to-generation change in a population s allele frequencies 2. The two main causes of microevolution

More information

Population and Community Dynamics

Population and Community Dynamics Population and Community Dynamics Part 1. Genetic Diversity in Populations Pages 676 to 701 Part 2. Population Growth and Interactions Pages 702 to 745 Review Evolution by Natural Selection new variants

More information

Chapter 16 Evolution of Populations. 16.1 Genes and Variation Biology Mr. Hines

Chapter 16 Evolution of Populations. 16.1 Genes and Variation Biology Mr. Hines Chapter 16 Evolution of Populations 16.1 Genes and Variation Biology Mr. Hines Figure 1-21 Levels of Organization Section 1-3 Levels of organization Biosphere Ecosystem The part of Earth that contains

More information

Evolution and the Origin of New Species

Evolution and the Origin of New Species Evolution and the Origin of New Species The Species Concept A. Taxonomy 1. The science of classifying organisms based on their relationships with one another B. Species 1. A population or group of populations

More information

Another way to think about it: Species are the cross-sections of branches on the tree of life. We can only experience species as snapshots in time

Another way to think about it: Species are the cross-sections of branches on the tree of life. We can only experience species as snapshots in time We can only experience species as snapshots in time Another way to think about it: Species are the cross-sections of branches on the tree of life. What would it look like if we could zoom in on the branches

More information

Darwin & His Theories

Darwin & His Theories Darwin & His Theories The Origin of Species In 1859, Darwin publish his ideas in a book, The Origin of Species Stated animals and plants changed gradually over time; still changing. Animals living today

More information

Teacher Notes. Biology 30 Unit 4 Population Genetics

Teacher Notes. Biology 30 Unit 4 Population Genetics Biology 30 Unit 4 Population Genetics General Outcome D1: Students will describe a community as a composite of populations in which individuals contribute to a gene pool that can change over time. A. Genetic

More information

Allopatric speciation is the evolution of reproductive barriers between populations that are geographically separated.

Allopatric speciation is the evolution of reproductive barriers between populations that are geographically separated. Speciation For one species to become two, separate populations of the same species must become reproductively isolated. For reproductive isolation to evolve, some change must occur in one or both lineages

More information

Section 10.1. KEY CONCEPT There were theories of biological and geologic change before Darwin.

Section 10.1. KEY CONCEPT There were theories of biological and geologic change before Darwin. Section 10.1 KEY CONCEPT There were theories of biological and geologic change before Darwin. Early scientists proposed ideas about evolution. Evolution is the biological change process by which descendants

More information

Workshop on Microevolution

Workshop on Microevolution Workshop on Microevolution by Dana Krempels I. Discuss the meaning of: a. species f. heritable traits (consider "nature vs. nurture") b. population g. lethal alleles c. gene pool h. adaptive, maladaptive,

More information

Population Genetics page 1

Population Genetics page 1 Population Genetics page 1 Objectives Learn basic principles of population genetics and microevolution through the use of a computer model. Pre-lab assignment Before lab, read the introductory material

More information

Name Period. 3. How many rounds of DNA replication and cell division occur during meiosis?

Name Period. 3. How many rounds of DNA replication and cell division occur during meiosis? Name Period GENERAL BIOLOGY Second Semester Study Guide Chapters 3, 4, 5, 6, 11, 14, 16, 17, 18 and 19. SEXUAL REPRODUCTION AND MEIOSIS 1. What is the purpose of meiosis? 2. Distinguish between diploid

More information

Speciation. Mechanisms of Isolation. Overview

Speciation. Mechanisms of Isolation. Overview 1 Speciation Overview For convenience, we can analyze speciation as a three-step process: 1) an initial step that isolates populations; 2) a second step that results in the divergence of characteristics

More information

Introduction to Biological Anthropology: Notes 5 What are species and how do they arise? Copyright Bruce Owen 2009 Two ways to look at evolution We

Introduction to Biological Anthropology: Notes 5 What are species and how do they arise? Copyright Bruce Owen 2009 Two ways to look at evolution We Introduction to Biological Anthropology: Notes 5 What are species and how do they arise? Copyright Bruce Owen 2009 Two ways to look at evolution We can look at it up close as we did with the minor variations

More information

9th Grade. 9th -12th Grade History - Social Science. 9th -12th Grade Sciences

9th Grade. 9th -12th Grade History - Social Science. 9th -12th Grade Sciences 9th Grade 9th -12th Grade History - Social Science Historical and Social Sciences Analysis Skills Chronological and Spatial Thinking 1. Students compare and contrast the present with the past, evaluating

More information

II B. Gene Flow. II C. Assortative Mating. II D. Genetic Drift. II E. Natural Selection. Northern Elephant Seal: Example of Bottleneck

II B. Gene Flow. II C. Assortative Mating. II D. Genetic Drift. II E. Natural Selection. Northern Elephant Seal: Example of Bottleneck I. What is Evolution? Agents of Evolutionary Change The Five Forces of Evolution and How We Measure Them A. First, remember that Evolution is a two-stage process: 1. Production and redistribution of variation

More information

What is evolution? - Helena Curtis and N. Sue Barnes, Biology, 5th ed. 1989 Worth Publishers, p.974

What is evolution? - Helena Curtis and N. Sue Barnes, Biology, 5th ed. 1989 Worth Publishers, p.974 Chapter 16 What is evolution? Evolution is a process that results in heritable changes in a population spread over many generations. Evolution can be precisely defined as any change in the frequency of

More information

Genetic Drift Simulation. Experimental Question: How do random events cause evolution (a change in the gene pool)?

Genetic Drift Simulation. Experimental Question: How do random events cause evolution (a change in the gene pool)? Genetic Drift Simulation Experimental Question: How do random events cause evolution (a change in the gene pool)? Hypothesis: Introduction: What is Genetic Drift? Let's examine a simple model of a population

More information

Evolution: The process by which organism change over time. Based on science, not opinion.

Evolution: The process by which organism change over time. Based on science, not opinion. Evolution Evolution: The process by which organism change over time. Based on science, not opinion. Darwin: Evolution is descent with modification Evolution: changes through time 1. Species accumulate

More information

Species Concepts and Speciation

Species Concepts and Speciation Species Concepts and Speciation Speciation - Contents What are species? Definitions and concepts. Forms of speciation. Reproductive isolating mechanisms. Clines and ring species. How many species are there?

More information

Continuous and discontinuous variation

Continuous and discontinuous variation Continuous and discontinuous variation Variation, the small differences that exist between individuals, can be described as being either discontinuous or continuous. Discontinuous variation This is where

More information

Assessment Schedule 2013 Biology: Demonstrate understanding of genetic variation and change (91157)

Assessment Schedule 2013 Biology: Demonstrate understanding of genetic variation and change (91157) NCEA Level 2 Biology (91157) 2013 page 1 of 5 Assessment Schedule 2013 Biology: Demonstrate understanding of genetic variation and change (91157) Assessment Criteria with with Excellence Demonstrate understanding

More information

Chapter 23. (Mendelian) Population. Gene Pool. Genetic Variation. Population Genetics

Chapter 23. (Mendelian) Population. Gene Pool. Genetic Variation. Population Genetics 30 25 Chapter 23 Population Genetics Frequency 20 15 10 5 0 A B C D F Grade = 57 Avg = 79.5 % (Mendelian) Population A group of interbreeding, sexually reproducing organisms that share a common set of

More information

Biology Performance Level Descriptors

Biology Performance Level Descriptors Limited A student performing at the Limited Level demonstrates a minimal command of Ohio s Learning Standards for Biology. A student at this level has an emerging ability to describe genetic patterns of

More information

Macroevolution: Sympatric Speciation

Macroevolution: Sympatric Speciation Macroevolution: Sympatric Speciation Types of Speciation: A Review Allopatric speciation is the evolution of geographically isolated populations into distinct species. There is no gene flow, which tends

More information

Allopatric Speciation Evolution Biology 4974/597 D.F. Tomback

Allopatric Speciation Evolution Biology 4974/597 D.F. Tomback Biology 4974/5974 Evolution Allopatric Speciation And Hybridization Grant and Grant 2002 R.J. Abbott (2003)Science 302: 1189-1190 Learning goals Learning Goals--Know and understand: The reproductive isolating

More information

Problem Set 5 BILD10 / Winter 2014 Chapters 8, 10-12

Problem Set 5 BILD10 / Winter 2014 Chapters 8, 10-12 Chapter 8: Evolution and Natural Selection 1) A population is: a) a group of species that shares the same habitat. b) a group of individuals of the same species that lives in the same general location

More information

Evolution, Natural Selection, and Speciation D. L. A. Underwood Biology Entomology. A. Adaptation. 4. Adaptedness is at the phenotypic level.

Evolution, Natural Selection, and Speciation D. L. A. Underwood Biology Entomology. A. Adaptation. 4. Adaptedness is at the phenotypic level. Evolution, Natural Selection, and Speciation D. L. A. Underwood Biology 316 - Entomology A. Adaptation 1. Three definitions: a. Any behavioral, morphological, or physiological trait that is assumed to

More information

LAB 11 Natural Selection (version 2)

LAB 11 Natural Selection (version 2) LAB 11 Natural Selection (version 2) Overview In this laboratory you will demonstrate the process of evolution by natural selection by carrying out a predator/prey simulation. Through this exercise you

More information

Assessment Schedule 2012 Science: Demonstrate understanding of biological ideas relating to genetic variation (90948)

Assessment Schedule 2012 Science: Demonstrate understanding of biological ideas relating to genetic variation (90948) NCEA Level 1 Science (90948) 2012 page 1 of 5 Assessment Schedule 2012 Science: Demonstrate understanding of biological ideas relating to genetic variation (90948) Assessment Criteria ONE (a) (b) DNA contains

More information

Lecture 22 Speciation

Lecture 22 Speciation Lecture 22 Speciation These facts seemed to me to throw some light on the origin of species that mystery of mysteries. C. Darwin The Origin What is speciation? in Darwin s words, speciation is the multiplication

More information

Evolution of Phenotypes

Evolution of Phenotypes Evolution of Phenotypes [Background section about the Grant s study of finches on the Galapagos] [see Beak of the Finch].. Daphne Island in the Galapagos Four species of Galapagos finches Peter Grant with

More information

A Hands-On Exercise To Demonstrate Evolution

A Hands-On Exercise To Demonstrate Evolution HOW-TO-DO-IT A Hands-On Exercise To Demonstrate Evolution by Natural Selection & Genetic Drift H ELEN J. YOUNG T RUMAN P. Y OUNG Although students learn (i.e., hear about) the components of evolution by

More information

BIO 1: Review: Evolution

BIO 1: Review: Evolution Name: Class: Date: ID: A BIO 1: Review: Evolution True/False Indicate whether the statement is true or false. 1. Radiometric dating measures the age of an object by measuring the proportions of radioactive

More information

not to be republished NCERT Heredity and Evolution CHAPTER 9 Multiple Choice Questions

not to be republished NCERT Heredity and Evolution CHAPTER 9 Multiple Choice Questions CHAPTER 9 Heredity and Evolution Multiple Choice Questions 1. Exchange of genetic material takes place in (a) vegetative reproduction (b) asexual reproduction (c) sexual reproduction (d) budding 2. Two

More information

Ch 5. Evolution, Biodiversity, and Population Ecology. This lecture will help you understand:

Ch 5. Evolution, Biodiversity, and Population Ecology. This lecture will help you understand: Ch 5 Evolution, Biodiversity, and Population Ecology Part 1: Foundations of Environmental Science PowerPoint Slides prepared by Jay Withgott and Heidi Marcum Copyright 2008 2006 Pearson Education, Inc.,

More information

Mechanisms of Evolution

Mechanisms of Evolution page 2 page 3 Teacher's Notes Mechanisms of Evolution Grades: 11-12 Duration: 28 mins Summary of Program Evolution is the gradual change that can be seen in a population s genetic composition, from one

More information

Follow up on feedback & independent project drafts Follow up on minute papers Species concepts (cont.)

Follow up on feedback & independent project drafts Follow up on minute papers Species concepts (cont.) Spring 2014: Mondays 10:15am 12:05pm (Fox Hall, Room 204) Instructor: D. Magdalena Sorger Website: theantlife.com/teaching/bio295-islands-evolution LECTURE 10 Today: Follow up on feedback & independent

More information

Unit 1 - Fundamental Biology Skills and Knowledge

Unit 1 - Fundamental Biology Skills and Knowledge PREP TM AP* Biology Prep Course Syllabus Foundational Topics Review 10 units that cover fundamental biology topics typically covered in a general biology course. This content is perfect to use as a summer

More information

Evolutionary Background Key Concepts

Evolutionary Background Key Concepts Evolutionary Background Key Concepts Adaptation Descent with modification (Evolution as history) Natural Selection (Evolution as process) Some Special Problems What do we mean by adaptation? Altruism Group

More information

Paving the way for Darwin

Paving the way for Darwin Evolution and Natural Selection Introduction to Natural Selection History of Evolutionary Thought Theory of Natural Selection Examples of Natural Selection Chapters 1.4-1.6, Bush Introduction to Natural

More information

Evolution, Natural Selection, and Adaptation

Evolution, Natural Selection, and Adaptation Evolution, Natural Selection, and Adaptation Nothing in biology makes sense except in the light of evolution. (Theodosius Dobzhansky) Charles Darwin (1809-1882) Voyage of HMS Beagle (1831-1836) Thinking

More information

HONORS BIOLOGY 2A Lab: Speciation

HONORS BIOLOGY 2A Lab: Speciation HONORS BIOLOGY 2A Lab: Speciation Introduction: As natural selection acts upon the variations present in a population, certain phenotypes are favored in terms of survival and, more importantly, their ability

More information

AP Biology Learning Objective Cards

AP Biology Learning Objective Cards 1.1 The student is able to convert a data set from a table of numbers that reflect a change in the genetic makeup of a population over time and to apply mathematical methods and conceptual understandings

More information

Name Class Date WHAT I KNOW. about how organisms have changed. grown in complexity over time.

Name Class Date WHAT I KNOW. about how organisms have changed. grown in complexity over time. History of Life Evolution Q: How do fossils help biologists understand the history of life on Earth? 19.1 How do scientists use fossils to study Earth s history? WHAT I KNOW SAMPLE ANSWER: Fossils give

More information

TEST NAME: Genetics unit test TEST ID: GRADE:07 SUBJECT:Life and Physical Sciences TEST CATEGORY: School Assessment

TEST NAME: Genetics unit test TEST ID: GRADE:07 SUBJECT:Life and Physical Sciences TEST CATEGORY: School Assessment TEST NAME: Genetics unit test TEST ID: 437885 GRADE:07 SUBJECT:Life and Physical Sciences TEST CATEGORY: School Assessment Genetics unit test Page 1 of 12 Student: Class: Date: 1. There are four blood

More information

Random Genetic Drift & Gene Fixation

Random Genetic Drift & Gene Fixation Random Genetic Drift & Gene Fixation Arie Zackay July 31, 2007 Abstract Random Genetic Drift is one of the evolutionary forces that effects the distribution of alleles and changes their frequencies in

More information

Time allowed: 2 hours Answer ALL questions in Section A, ALL PARTS of the question in Section B and ONE question from Section C.

Time allowed: 2 hours Answer ALL questions in Section A, ALL PARTS of the question in Section B and ONE question from Section C. UNIVERSITY OF EAST ANGLIA School of Biological Sciences Main Series UG Examination 2014-15 EVOLUTIONARY BIOLOGY BIO- 5008B / BIO-2B10 Time allowed: 2 hours Answer ALL questions in Section A, ALL PARTS

More information

Speciation. 1. Species definitions. 2. Troublesome species. 3. Pre-mating and post-mating isolation. 4. Allopatric speciation (separate areas)

Speciation. 1. Species definitions. 2. Troublesome species. 3. Pre-mating and post-mating isolation. 4. Allopatric speciation (separate areas) Speciation 1. Species definitions 2. Troublesome species 3. Pre-mating and post-mating isolation 4. Allopatric speciation (separate areas) 5. Peripatric speciation (tiny isolated subpopulation) 6. Parapatric

More information

Population Genetics and Evolution

Population Genetics and Evolution ADVANCED PLACEMENT BIOLOGY Laboratory 8 Population Genetics and Evolution 7-650 TEACHER S MANUAL World-Class Support for Science & Math This protocol has been adapted from the Advanced Placement Biology

More information

AP Biology Essential Knowledge Student Diagnostic

AP Biology Essential Knowledge Student Diagnostic AP Biology Essential Knowledge Student Diagnostic Background The Essential Knowledge statements provided in the AP Biology Curriculum Framework are scientific claims describing phenomenon occurring in

More information

NOTES: CH 19 - The Fossil Record; History of Life; Macroevolution

NOTES: CH 19 - The Fossil Record; History of Life; Macroevolution NOTES: CH 19 - The Fossil Record; History of Life; Macroevolution Vocabulary: Paleontologist Fossil record extinct Relative dating Absolute dating Geologic time scale Objectives: What are fossils? How

More information

Evolution Unit Plan. Stage 1: Identify Desired Results Title: Evolution of Life

Evolution Unit Plan. Stage 1: Identify Desired Results Title: Evolution of Life Evolution Unit Plan Stage 1: Identify Desired Results Title: Evolution of Life Unit Description: Evolution is a topic that is fundamental to the study of Biology, linking areas such as genetics, molecular

More information

Population Genetics -- Evolutionary Stasis and the Hardy-Weinberg Principles 1

Population Genetics -- Evolutionary Stasis and the Hardy-Weinberg Principles 1 Population Genetics -- Evolutionary Stasis and the Hardy-Weinberg Principles 1 Review and Introduction Mendel presented the first successful theory of the inheritance of biological variation. He viewed

More information

10 What Is a Species? Th i n k a b o u t t h e many different types of organisms you see in a typical day.

10 What Is a Species? Th i n k a b o u t t h e many different types of organisms you see in a typical day. 10 What Is a Species? Th i n k a b o u t t h e many different types of organisms you see in a typical day. In addition to humans, you might see mammals such as dogs and cats; birds such as robins and pigeons;

More information

Speciation Adaptive landscapes. Speciation Adaptive landscapes. Speciation Adaptive landscapes. Speciation Adaptive landscapes

Speciation Adaptive landscapes. Speciation Adaptive landscapes. Speciation Adaptive landscapes. Speciation Adaptive landscapes Adaptive landscapes 1 Adaptive landscapes 2 Selection will tend to move populations in the direction of increased fitness. Selection isn t always directional: sometimes there is an optimal phenotype (or

More information

Feb 26: Song Dialects: Birds. Why Do Birds Sing?

Feb 26: Song Dialects: Birds. Why Do Birds Sing? Feb 26: Song Dialects: Birds Why Do Birds Sing? Why this is an ill-posed question need to specify the correct level of analysis (for now, we are referring to the functional question of survival value)

More information

Meiosis and Sexual Life Cycles

Meiosis and Sexual Life Cycles Meiosis and Sexual Life Cycles Chapter 13 1 Ojectives Distinguish between the following terms: somatic cell and gamete; autosome and sex chromosomes; haploid and diploid. List the phases of meiosis I and

More information

Applications in population genetics. Hanan Hamamy Department of Genetic Medicine and Development Geneva University

Applications in population genetics. Hanan Hamamy Department of Genetic Medicine and Development Geneva University Applications in population genetics Hanan Hamamy Department of Genetic Medicine and Development Geneva University Training Course in Sexual and Reproductive Health Research Geneva 2013 Population genetics

More information

Darwinian Natural Selection

Darwinian Natural Selection Darwinian Natural Selection Evidence of Evolution Direct observation: species change Fossils show intermediate forms Extant species show structural, developmental and genetic homology Vestigial traits

More information

Recommended Resources: The following resources may be useful in teaching this

Recommended Resources: The following resources may be useful in teaching this Unit E: Plant Propagation Lesson 1: Understanding Sexual Reproduction Student Learning Objectives: Instruction in this lesson should result in students achieving the following objectives: 1. Discuss the

More information