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23 Nov 2019

  1. A population undergoing natural selection would see a faster and more dramatic change in allele frequency if the starting generation contained more of the allele being selected against. [2 pt; L2; II.B]

    True

    False

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Irving Heathcote
Irving HeathcoteLv2
3 Jul 2019
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Related questions

A population of finches lives on an island some distance from the mainland, where another population of finches of the same species resides. In both populations, the size of the birds' beaks is influenced by two alleles at the beak locus, B and b. On the island, the frequency of the B allele is 0.9, and the frequency of the b allele is 0.1. On the mainland, both alleles are equally frequent (0.5).

a. If the genotypes at the beak locus have the following fitnesses on the island: wBB = 1, wBb = 0.95, wbb = 0.9, what is the change in the frequency of the B allele on the island in one generation due to natural selection?

b. What will be the change in the frequency of the B allele on the island in one generation as a combined result of migration and natural selection?

c. If the migration rate from the mainland to the island is 0.05 (meaning that 5% of individuals in the island population migrate in from the mainland every generation), what is the change in the frequency of the B allele in one generation due to migration? Assume there is no migration from the island back to the mainland.

If a selection pressure was against the trait of the dominant allele, what change in a population would you expect to see?

The allele for sickle-cell anemia is most common in countries with a high incidence of malaria, the allele for cystic fibrosis is more common than expected in Caucasians, and Huntington’s disease is inherited by a dominant allele. All three diseases are potentially fatal and it would seem that alleles for fatal diseases would be selected against and would eventually be eliminated. However, the type of allele and/or other factors may keep the disease prevalent in the gene pool. Explain and give EXAMPLE of these three phenomena in terms of how the allele frequency is maintained despite natural selection.

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