Question 2 (4 pts). A population of squirrels in H-W equilibrium has allele freq

Question

Question 2 (4 pts). A population of squirrels in H-W equilibrium has allele frequencies of 0.8 for allele S and 0.2 for allele s. A parasite infests the population, causing mortality and reduced fertility so that there is a selection pressure on the population.

What is the genotype frequency of EACH GENOTYPE BEFORE the parasite infests the population? (1pt)

b. (3 pts) If the number of adults and the number of offspring is as follows:

Genotypes

SS

Ss

ss

Number of adults

40

28

12

Number of offspring after infestation

120

104

64

What is the fitness (w) of each genotype?

Genotypes

SS

Ss

ss

Number of adults

40

28

12

Number of offspring after infestation

120

104

64

Explanation / Answer

a) genotypic frequencies before infestation:

SS= 0.8×0.8=0.64

ss=0.2×0.2=0.04

Ss= 2×0.8×0.2=0.32

b) Fitness can be calculated by dividing the number of offspring of one genotype by the maximum :

Fitness of SS=120/120=1.0

Fitness of Ss=104/120=0.867

Fitness of ss=64/120=0.533

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