Suppose that as long bills were evolving in pelicans, bill length was controlled

Question

Suppose that as long bills were evolving in pelicans, bill length was controlled by a single gene with two alleles, B and x, such that BB individuals had short bills and XX individuals had long bills. Further, suppose that B was dominant to X so that BX individuals had short bills just like BB individuals. Since long bills allowed pelicans to obtain more food, pelicans with long bills survived best and produced, on average, 2 surviving offspring during their lives, while individuals with short bills produced, on average, 0.75 surviving offspring during their lives. a) Suppose that in a virtually infinite population of pelicans that mate randomly with regard to bill length, do not experience mutation, and do not move among populations, the frequency of the X allele in the gametes at the start of a generation is 0.3. What will be the frequency of the XX genotype in the zygotes produced by union of these gametes? b) Determine the frequency of the XX genotype in the surviving adults that develop from the zygote population.

Explanation / Answer

a 0.3×0.3 = 0.09

b Frequency of XX genotype in the surviving adult that develop from zygote population is0.3×0.3×0.75 = 0.0675

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