Suppose two allele, A1 and A2, exhibit overdominance, and fitnesses are as follo

Question

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 balanced 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?

Genotype

A1A1

A1A2

A22

Fitness

0.8

1.0

0.9

Explanation / Answer

a) Both A1 and A2 coexist in a balance as heterozygotes contain both the chatacters of the parents ,hence helpful in long run.

b) If the parents are hermaphroditic,there is a better selfing rather than a non-hermaphroditic parents

C)Apomixis is replacement of sexual reproduction by asexual reproduction with fertilization,they resulting in identical offspring

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