5Consider a single gene with two alleles A and a in a popula

5.Consider a single gene with two alleles, A and a, in a population. What is the frequency of the AA genotypes in zygotes drawn from a gene pool where A=0.3 and a=0.7, if they are in Hardy-Weinberg proportions?

0.3

0.09

0.7

1

0.42

4.Match the form of selection on the left, with it\'s population genetic consequence on the right

Overdominance

Frequency-dependent selection

Selection against a dominant allele and for a recessive allele

Selection against a recessive allele and for a dominant allele

Genotype fitness changes depending on its frequency

Recessive allele decreases in frequency, but is not completey lost because its hidden in heterozygotes

Loss of dominant allele, fixation of recessive allele

Increases frequency of heterozygotes

3.An effective population size that is less than the census population will REDUCE the effects of drift.

True

False

2.Mutations must usually occur in somatic cells, and not in germ cells, to be relevant for evolutionary change.

True

False

1.Which of the following is NOT associated with genetic drift?

loss of heterozygosity

fixation of alleles

increase in homozygotes

increase in allelic diversity

Solution

5. The frequency of allele A = 0.3

Frequency of genotype AA = (0.3)² = 0.09. Option 2 is correct.

4.

1) Overdominance : D. Increases frequency of heterozygotes

2) Frequency-dependent selection: A.Genotype fitness changes depending on its frequency

3) Selection against a dominant allele and for a recessive allele : C.Loss of dominant allele, fixation of recessive allele

4) Selection against a recessive allele and for a dominant allele: B. Recessive allele decreases in frequency, but is not completey lost because its hidden in heterozygotes

3. An effective population size that is less than the census population will REDUCE the effects of drift: The given statement is false. This is because effective population is the population producing offspring. It is smaller than census population.The effect of genetic drift is more on effective population rather than on census population. This is because effective population is sensitive to changes in census population and this may lead to genetic drift resulting in variation in effective population.

2. Mutations related evolutionary change may occur in both somatic as well as germline cells. The evolutionary change mostly occur due to mutations in germline cells rather than in somatic cells. The given statement is false.

1. Genetic drift is the allelic variation among population. It is the phenomenon by which the population survive and produce fertile offspring. The environmental or some other factors influence allelic variation reducing the probability of producing fertile offspring. Fixation of alleles is not associated with genetic drift. If an allele is fixed, then genetic drift is no more functional or it becomes halted in the population. Option b is correct.