25. In a classic study of the Hopi, a Native American tribe of central Arizona,

Question

25. In a classic study of the Hopi, a Native American tribe of central Arizona, Woolf and Dukepno (1959) found 26 albino individuals in a total population of 6000. A single gene with two alleles causes this form of albinism. What more do we need to know to be able to compute the allele frequencies for this gene? a. Nothing, I'm ready to compute it right now. b. Whether albinism is caused by a loss of function mutation c. Whether the population is in Hardy-Weinberg equilibrium d. The phenotype of the heterozygote e. We must know both b and c 26. Mutations in the GDF9 gene in sheep have been linked to changes in female fecundity. The following are the relative fitnesses of different genotypes in the population Relative fitness 0.7 0.1 (a) this is an example of negative frequency-dependent selection: genetic variation will be lost over time this is an example heterozygote advantage; genetic variation will be maintained over time (c) this is an example of negative frequency-dependent selection: genetic variation will be maintained over time (d)this is an example of heterozygote advantage; genetic variation will be lost over ime

Explanation / Answer

Option d is true. It is necessary to have the phenotype of heterozygote. It is because there is two genes are interacting (because of albino case which a recessive epistasis).

Option b is true. The heterozygote relative fitness is higher than homozyogtes. That is showing that variation is increasing the fitness.

Option b is true. To be fixed in a gene pool the allele should be selected strongly.

Option b is true. In the case of phenotypically plasticity the individual changes its phenotype due to the environmental changes. Genotype changes are normal characteristics.

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