GENE310 - Population and Quantitative Genetics Assignment

Assignment Task

Question 1

1. What are the assumptions of the simple population growth model? 

2. The relative fitness of genotypes CC , Cc and cc are 6, 1.0 and 0.7 respectively. The initial frequency of allele C is 0.9. What is the frequency of the C allele and c allele after 1 generation of selection? 

3. What is absolute fitness?

4. Using less than 1000 words write a comprehensive essay on how natural selection has affected any species of your Be explicit in your response.

Question 2 

The data below was collected for two separate island populations of frogs in the Caribbean. Assume that natural selection remains constant, which population will have the highest average fitness?

Question 3

Albinism in Springboks is a rare colour mutation caused by a recessive allele . Albinism results in white fur colouration which gives Springboks a distinct disadvantage in nature because they are highly visible to predators. Recently, a bovid survey was conducted in Hluhluwe game reserve in KZN. During the survey, genetic samples were taken and the number of normal (wild-type) and albino Springboks noted. An additional survey was conducted one breeding season after the initial survey to determine the survival of normal and albino Springbok

Using the data given in the table above, answer the following questions:

1. What is the frequency of the recessive allele in the initial Springbok population?

2. What is the growth rate of each genotype in Hluhluwe population?

3. Is having the albino phenotype a real disadvantage to a Springbok in Hluhluwe? What is the relative fitness of each genotype? 

4. If viability selection remains constant, what is the allele frequency of the recessive allele in the population after selection?

Question 4 

a. Shown below is a table of phenotypic values measured on each member of a random sample of 100 individuals. Estimate the mean, variance and standard deviation in the population from which the sample was drawn.

b. Assuming that the sample in Question 1 was drawn from a normal distribution, what number of individuals in the sample is expected to have a phenotypic value exceeding the mean plus one standard deviation? What number of individuals in the sample is expected to have a phenotypic value smaller than the mean minus one standard deviation? How do these predictions compare with the observations?

c. Assuming that the sample in Question 1 was drawn from a normal distribution, what number of individuals in the sample is expected to have a phenotypic value exceeding the mean plus two standard deviations? What number of individuals in the sample is expected to have a phenotypic value smaller than the mean minus two standard deviations? How do these predictions compare with the observations?

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