3 Not all traits are simply inherited by dominant and recessive alleles (Mendelian Genetics). In some traits, neither allele is dominant or many alleles control the trait. Below are different ways in which traits can be inherited from parents to offspring.
5 Definition: Neither allele for a gene dominates Phenotype of the heterozygous offspring will be a BLEND of the 2 homozygous parents. Homozygous Parent Heterozygous Offspring Homozygous Parent
6 Ex: A homozygous white flower crossed with a homozygous red flower will produce all heterozygous pink flowers. Homozygous Parent Heterozygous Offspring Homozygous Parent
7 Notation: Alleles are all capital letters because NEITHER one dominates the other. So one of the alleles has a prime ( ) on it to represent an alternate expression of the gene.
8 Always make a KEY to show the genotypes and the resulting phenotypes. Still supports Mendel s Law of Independent Assortment
9 Ex. 1) In a certain species of flowers, snapdragons, the combined expression of both alleles for flower color produces a new phenotypepink. A red snapdragon is homozygous and is crossed with a homozygous white snapdragon. What are the genotypic and phenotypic ratios of this cross?
10 Key: Red = RR White=R R Pink = RR P cross = x R R G: 100% RR P: 100% PINK
11 Ex. 2) Then cross the F 1 generation and what are the genotypic and phenotypic ratios of this cross?
12 Key: Red = RR White=R R Pink = RR P cross = RR x RR R R G: 1RR:2RR : R P: 1Red:2Pink: R
13 Definition: Both alleles are expressed EQUALLY
14 Phenotypes of heterozygous offspring are showing both traits! Ex: red cows crossed with white will generate roan cows. Roan refers to cows that have red coats with white blotches. X =
15 Notation: 2 different alleles (capital letters) are used Always make a KEY to show the genotypes and the resulting phenotypes
16 In chickens, black-feathered is not wholly dominant over white-feathered, so heterozygous chickens are black and white checkered. Cross two heterozygous chickens. What would the appearance of their offspring be?
17 Key: P cross = Phenotype: 1Black:
18 In shorthorn cattle, the hybrid between red and white is called a roan. What phenotypes would result in the cross of a roan and a white?
19 Key: P cross= x Phenotype:
21 Mode of Inheritance Define Notations Example Incomplete Dominance Neither allele for a gene dominates so the hybrid phenotype is a BLEND of the homozygous parents Alleles are all capital letters because NEITHER one dominates the other. One of the alleles has a prime ( ) on it to represent an alternate expression of the gene. A homozygous white flower is crossed with a homozygous red flower and produces all pink flowers. Blended trait is the HYBRID KEY: Red = RR White = R R Pink = RR
22 Mode of Inheritance Define Notations Example Codominance Both alleles are expressed equally 2 different capital letters (alleles) are used A black chicken is crossed with a white chicken and black and white checkered chickens are produced. KEY: Black = BB White = WW Checkered = BW
23 Definition: More than 2 alleles for a single gene can control a trait. Multiple alleles must be studies by looking at the entire population of species.
24 Each individual carries only 2 alleles for any gene (one on each homologous chromosome). In this form of inheritance, a trait can have 1 gene, but 100 alleles for that gene.
25 Ex: The human blood group can be any combination of A, B, and O
26 The alleles are I A, I B, and i Alleles A and B are CODOMINANT Alleles i ( O ) is RECESSIVE
27 Notation: The possible genotypes/phenotypes: GENOTYPES PHENOTYPES Homozygous type A I A I A type A blood Heterozygous type A I A i type A blood Homozygous type B I B I B type B blood Heterozygous type B I B i type B blood Codominant type AB I A I B type AB blood Recessive type O ii type O blood
28 NOTE: the i is dropped from the genotype of A and B when the phenotype is written. (Genotype I A i is type A blood)
29 In the U. S., about 45% of the population is type O, 42% type A, 10% type B, and only 3% type AB.
31 The positive and negative of a blood type is called the Rh factor, it is a totally separate gene with Rh + (RR or Rr) and Rh alleles (rr) If you have the protein = Rh + If you DO NOT have the protein = Rh
32 In the U. S., about 85% of the population is Rh + and 15% Rh. Thus the chances of someone being O- [having both ii and rr] would be 45% 15% = 6.75%.
33 The most rare blood type would be AB-, about 0.45% of the population. O is the universal donor AB is the universal receiver
34 1) If a person of blood group AB marries one belonging to group O, what could be the possible genotypes and phenotypes of their offsprings blood types?
35 P cross = I A I B x ii I A I B Genotypes: i I A i I B i 2 I A i : 2 I B i i I A i I B i Phenotypes: 2 Type A: 2 Type B
36 If a father is homozygous blood type A and the mother is heterozygous blood type B. What could be the possible genotypes and phenotypes of their offspring s blood types?
37 P cross = I A I A x I B i I A I A I B I A I B I A I B Genotypes: 2 I A i : 2 I A I B i I A i I A i Phenotypes: 2 Type A: 2 Type AB
38 2 Types of Chromosomes: 1. Sex chromosomes- last pair of chromosomes 23 rd pair for humans XX = female XY = male
39 2. Autosomal chromosomes or Autosomes All other pairs of chromosomes 1-22 nd pair in humans
40 Other genes besides the alleles for sex are located on the sex chromosomes.
41 Definition: These traits will occur MORE frequently in males than females, such as color blindness and hemophilia.
42 WHY? Alleles for a gene may be present on the X chromosome but absent on the Y. These are called sexlinked genes.
43 This means that males may inherit just one allele for a characteristic and that allele will be expressed, whether it is dominant or recessive, because it is the only allele present on their X chromosome.
44 X-linked traits most likely will be RECESSIVE to the normal condition and the Y chromosome lacks the gene for a trait, so males have a higher chance of having the disorder.
45 These traits generally do NOT show up in females since females have genes on both their X chromosomes.
46 Notation: The alleles for these traits are written as superscripts on the X chromosome ONLY.
47 No alleles are written on the Y chromosome! Ex: Colorblind male = X b Y and Normal male = X B Y Heterozygous FEMALES are known as carriers, X B X b
48 Ex.1) Color blindness is a sex-linked trait that is caused by a recessive allele. A colorblind man marries a woman that is homozygous for normal vision.
49 P cross X N X N x X n Y X N X N What possible types of vision could be found if they had boys? Normal X n X N X n X N X n What possible types of vision Y X N Y X N Y could be found if they had girls? Normal
50 Ex.2) A girl of normal vision, whose father was colorblind, marries a colorblind man. What types of vision could be found in their children?
51 P cross = X N X n x X n Y X N X n X n X N X n X n X n What types of vision could be found in their children? 50% Normal vision and 50% colorblindness Y X N Y X n Y
52 Traits are determined by MANY genes They may or may not be found on the same chromosome Each gene may have more than 2 alleles
53 The phenotypes may vary depending on the number of dominant and recessive alleles in the genotype
54 Traits that show great variability are a result of polygenic inheritance Ex: eye color, skin color, height, facial features
55 The environment can determine whether or not a gene is fully expressed or expressed at all.
56 Internal and external environments can affect phenotypes: 1. Influence of internal environment: ~ Hormones based on sexes (testosterone, estrogen)
58 All of these can influence the expression of genes.
60 Mode of Inheritance Define Notations Example Multiple Alleles More than 2 alleles for a single gene can control a trait A & B are codominant o Use capital I with superscripts for specific allele O is recessive o Use lowercase i BLOOD TYPES Type O = ii Heterozygous Type A= I A i Homozygous Type A = I A I A Type AB = I A I B Heterozygous Type B= I B i Homozygous Type B = I B I B
61 Mode of Inheritance Define Notations Example Sex Linked Traits are carried on the X chromosomes The alleles for these traits are written as superscripts on the X chromosome ONLY. COLORBLINDNESS,HEMOPHILIA Colorblind male = X b Y Normal male = X B Y Colorblind female= X b X b Normal female = X B X B, No alleles are written on the Y chromosome! X B X b Carrier = X B X b
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