Q [1] A new ski resort diverts several connecting streams and divides a previous

Question

Q [1] A new ski resort diverts several connecting streams and divides a previously very large randommating leopard frog (Rana pipiens) population into 4 small isolated populations at different ponds. By chance, each pond population got different numbers of males and females at the time of division: A got 20 males and 70 females, B got 10 females and 90 males, C got 40 females and 40 males, and D got 10 males and 0 females.

a. What is the effective population size of each new population?

b. Which population will lose the most heterozygosity in the generation following isolation? Why? (be brief)

Q [2] Malaria and sickle-cell anemia result in heterozygous advantage in Nepal at a gene producing hemoglobin. Viabilities (fitnesses) are 0.8, 1.0, and 0.4 for the AA, AS, and SS genotypes, respectively. What is the expected equilibrium frequency of the A allele in Nepal?

Q [3] The frequency of an allele Y in population A is 0.75. The frequency of this same allele in population B is 0.20. If these populations exchange migrants at a rate of 25%, what is the expected frequency of allele Y in population B after one generation?

Explanation / Answer

1. A = 70 females 20 males;B = 10 females and 90 males;C =40 females and 40 males, D = 10 males and 0 females.

effective population size in new population:70

population D will loose most heterozygosity: A will have highest. due to the proportion male:female

2.equilibrium frequency of the A allele:0.73

3. allele Y in population B after one generation:0.18

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