Step-by-Step Solution
In a population at equilibrium, and between mutation and selection for a recessive allele, the value of s is 0.5 and ??is 10-5.
a) The equilibrium frequency of the allele can be calculated by the following formula:
Therefore, the equilibrium frequency of the allele q is
.
Genetic cost = sq2
.
b) If individual members of the population are irradiated to cause the mutation rate to double, the new equilibrium frequency of the allele would be:
Therefore, the new equilibrium frequency of the allele q is
.
Genetic cost is calculated in the following way:
.
c) If the mutation rate remains unchanged, but the selection coefficient is reduced to 0.3, the new equilibrium frequency can be calculated as follows:
Genetic cost is calculated in the following way:
Therefore, the new equilibrium frequency and the new selection cost of the allele are 
and 
respectively.
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