Question

1. Evolution by natural selection occurs only if… A. traits are passed on through the germline. B. traits involved are not epistatic to others in the genome. C. traits contribute to differences in fitness and adaptation. D. A and C are correct. E. A, B, C are correct.

2. Below is a data set on the wing coloration in the scarlet tiger moth (Panaxia dominula). Coloration in this species has been shown to behave with non-Mendelian inheritance (the type is ______________ _____________ ). Show your work for parts a-e below. White-spotted (AA) 1,350 Intermediate (Aa) 2,000 Little spotting (aa) 650

a. Calculate the frequency of the A allele.

b. Calculate the frequency of the a allele.

c. Calculate the frequency of AA genotype.

d. Calculate the frequency of Aa genotype.

e. Calculate the frequency of aa genotype.

Answer 1

1. Answer: Option D is correct
Explanation:
Evolution = Descent with modfication
Natural selection is the driving force of evolution.
Natural selection acts on populations if traits are passed onto next generation through germ line.
Natural selection can act differently on different traits i.e. different traits exhibit different fitness values

2. The given case is an example of incompelte dominance
Total population size = 1350+2000+650
= 4000

Total number of alleles = 8000 (Assuming the organism is diploid)

H-W equilibrium:
p+q = 1
p2+2pq+q2 = 1

Frequency of AA genotype = 1350/4000
= 0.3375

Frequency of Aa genotype = 2000/4000
= 0.5

Frequency of aa genotype = 650/4000
= 0.1625

Frequency of A allele = [(1350*2) + (2000)]/8000
= 4700/8000
= 0.5875

Frequency of a allele = [(650*2) + (2000)]/8000
= 3300/8000
= 0.4125