Question 4 Suppose two allele, A1 and A2, exhibit overdominance, and fitnesses a

Question

Question 4 Suppose two allele, A1 and A2, exhibit overdominance, and fitnesses are as follows: Genotype A1A1 A1A2 A22 Fitness 0.8 1.0 0.9 a) In a large population where both alleles are initially present, mating occurs at random. What do you expect in the long run: A1 goes to fixation? A2 goes to fixation? Or A1 and A2 coexist in a balnaced polymorphism? Explain why. b) What should we expect to observe if instead the population is strictly selfing, with hermaphroditic parents that self-fertilize exclusively? c) What would happen if all members of the population reproduce apomictically; that is, asexual parents produce offspring that are genetically identical to themselves?

Explanation / Answer

Both the alleles will co exist in a balanced polymorphism as the fitness of the mixed phenotype or a heterozygote is higher than the fitness of either alleles.

If the population show only selfing then, the allele difference can become the basis of disruptive mechanism and two different species can evolve.

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