Monohybrid Inheritance. Intermediate 2 Biology Unit 2: Environmental Biology and Genetics
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1 Monohybrid Inheritance Intermediate 2 Biology Unit 2: Environmental Biology and Genetics
2 Inherited Characteristics Inherited characteristics are passed on from one generation to the next through sexual reproduction Chromosomes are made up of genes Alleles are different forms of the same gene
3 Glossary Genotype genes possessed by an organism Phenotype physical appearance of an organism Homozygous 2 identical alleles for a particular characteristic Heterozygous 2 different alleles for a particular characteristic
4 Glossary Dominant allele which controls the development of a characteristic when it is present on only one chromosome. Recessive allele which control the development of a characteristic if present on both chromosomes.
5 Further definitions P Parents F1 first generation F2 second generation
6 Genetics and symbols The dominant allele is given a capital letter The recessive allele is given a lower case letter In plants, tall is dominant to dwarf T = tall t = dwarf
7 True-breeding An individual that is true-breeding has two identical alleles for the characteristic True breeding plants are homozygous In pea plants TT is true-breeding tall plant tt is a true breeding dwarf plant
8 Monohybrid Inheritance This is a genetic cross involving only one gene (characteristic)
9 A cross between a true breeding tall pea plant with a true-breeding dwarf pea plant. P phenotype P genotype Gametes F 1 genotype F 1 phenotype
10 Members of the F 1 generation are self-pollinated F 1 phenotype F 1 genotype Gametes Fertilisation F 2 genotype ratio F 2 phenotype ratio
11 Time to practice In pea plants, round is dominant to wrinkled seeds. A cross was carried out between a pea plant homozygous for round seeds and a pea plant with wrinkled seeds. Carry out the cross through to the F 2 generation
12 In pea plants, round is dominant to wrinkled seeds. A cross was carried out between a pea plant homozygous for round seeds and a pea plant with wrinkled seeds. P phenotype P genotype Gametes F 1 genotype F 1 phenotype
13 Members of the F 1 generation are self-pollinated F 1 phenotype F 1 genotype Gametes Fertilisation F 2 genotype ratio F 2 phenotype ratio
14 Monohybrid Inheritance practice questions Remember to state symbols used at start Lay out the cross using headings P phenotype P genotype Gametes F 1 genotype F 1 phenotype F 1 self pollinated F 1 phenotype F 1 genotype Gametes Fertilisation F 2 genotype ratio F 2 phenotype ratio
15 Polygenic inheritance This is inheritance when the characteristic is controlled by more than one gene eye colour in humans Seed mass in pea plants
16 Predicting number of offspring A monohybrid cross between two truebreeding parents will always produce a 3:1 phenotype ratio in the F 2 generation. Often there is a difference between observed and expected results due to fertilisation being a random process which involves the element of chance.
17 Using a bead model to illustrate a monohybrid cross This model represents self-pollination of the F1 generation of pea plants following a cross between a true-breeding pea plant with lilac flowers and a whiteflowered pea plant. You will be provided with two beakers containing 100 lilac beads and 100 white beads These are to represent heterozygous lilacflowered pea plants
18 Using a bead model to illustrate a monohybrid cross Collect three beakers labelled LL, Ll and ll Use the gamete beads to form and classify zygotes Record your results as a tally mark for the three genotypes Express your results as a F 2 phenotypic ratio.
19 4 Cross number LL Ll ll ratio
20 Human Inheritance A family tree can be used to trace a particular trait through several generations.
21 Working out genotypes using a family tree Let T = tongue rolling ability Let t = inability to roll tongue
22 Co-dominance Co-dominant alleles are both expressed in the phenotype of a heterozygous organism. E.g. Flower colour RR = red Rr = pink Rr = white This co-dominant cross would give a 1:2:1 phenotype ratio
23 Human Blood Groups There are three alleles for human blood groups I A I B I o I A and I B are co-dominant I o is recessive
24 Human Blood Groups genotype I A I A I A I o I B I B I B I o I A I B I o I o Blood Group Phenotype A A B B AB o
25 Environmental impact on phenotype Phenotype is a result of interaction between the genotype the effect of the environment on growth and development. Some characters are unaffected by environmental factors Tongue rolling ability ABO blood groups
26 Same genotype, different phenotypes Identical twins in humans A twin fed a poorer diet will fail to reach full potential height Clones in plants (asexual reproduction) Arrowhead plant (pg193) Differences caused by environmental factors are not passed on to next generation
27 evolution Two scientists, two theories Acquired characteristics Lamark Natural Selection - Darwin
28 Natural selection Variation Over-production All species of organisms has a large reproductive potential Struggle for survival The environment can not support all offspring and this leads to competition
29 Survival of the fittest Offspring whose phenotypes are better adapted to their environment have a better chance of surviving Pass on genes to their offspring Offspring whose phenotype are less well-suited to environment die before reaching reproductive age Fail to pass on genes
30 Charles Darwin Observation 1: Living things have the potential to produce more offspring than are needed to replace them. Observation 2: The number of organisms in the wild, however, usually remains the same. Deduction: Darwin deduced that some organisms must die before they reproduce.
31 Observation 3: Most living things show variation. No two individuals are usually alike. Deduction: Darwin concluded that the organisms which survived were the best adapted or fittest Observation 4: Some types of variation are passed on from parents to their offspring. Deduction: Populations will slowly change or evolve as successful parents pass on characteristics to their offspring.
32 Natural Selection in Action Peppered Moth Two forms Light brown with speckles Melanic (dark) form Both forms flay at night and rest on tree trunks during the day
33 Peppered moth A modern example of evolution Pale coloured, speckled peppered moth
34 Peppered moth A modern example of evolution Dark coloured peppered moth
35 Peppered moth A modern example of evolution Peppered moths on tree trunk
36 In non-polluted areas, tree trunks are covered with lichens, the light form is well camouflaged against the background. In polluted areas, toxic gases kill the lichens and soot particles darken the trunks. The melanic (dark) form is favoured by natural selection.
37 Natural Selection in Action Activity You will be given two different colours of punched paper Spread out 50 discs of each colour onto to the sheet of A3 paper Start the stopwatch/ stopclock and time one minute. During this time, use the forceps to pick out as many paper discs as possible Place the paper discs in a Petri dish. Count how many paper discs of each colour you have removed. If the total number is an odd number, pick out one more grain. Add more paper discs the paper to make it up to 100 again, by adding equal numbers of each colour. Make a note of how many grains there are of each colour now. The proportion of the two colours will now be different.
38 Time another minute and pick out as many paper discs as possible. Repeat this 4 more times Repeat the whole activity on a sheet of news paper
39 Trial one on white paper At start 1 st pick 2 nd pick 3 rd pick 4 th pick 5 th pick Number of discs removed Number of discs replaced Percentage of discs in each colour white newspaper white newspaper white newspaper
40 Trial one on news paper At start 1 st pick 2 nd pick 3 rd pick 4 th pick 5 th pick Number of discs removed Number of discs replaced Percentage of discs in each colour white newspaper white newspaper white newspaper
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