Suppose you take a look at a specific population of this species, and survey the

Question

Suppose you take a look at a specific population of this species, and survey the genotype numbers on two successive generations:

a, What is the mean fitness of the population in the first generation? In the second generation?

b, How have the allele frequencies changed from the first to the second generations?

c, What are the apparent fitnesses of the three genotypes?

d, If these fitnesses don't change, what will eventually happen to the genetic make-up of the population?

Explanation / Answer

a) the speed with which each allele or genotype frequencies changesis driven by the relative fitness for each allele or genotype . Fitness is relative value usually measured in comparison to most fit allele / genotype in the population considered.

Mean fitness of population given by

W = p2 (wAA) + 2pq ( wAa) + q2 (waa)

In first generation

AA. Aa. aa

159. 292. 105. Total = 556

Relative fitness 159/292. 292/292. 105/292

.544. 1. .359

p = (2*159)+292/2*556

p = .548

q = 1-p = .452

p2 = 0.30

q2 = 0.20

2pq = 0.494

W= 0.3 x .544 +.494x 1 + 0.20 x .359

W= 0.73

Similarily for second generation

Realtive fitness 0.74. 1. 0.285

p2 = 0.373

q2 = 0.150

2pq = .056

W = .373 x .74 + .056 x 1+ .150x .285

W= 0.126

c) apparent fitness of 3 genotype is a mean fitness value associated with phenotypic value. Genotype and environment determine phenotype of an individual

b) allele frequency of p increase in second generation whereas frequency of q allele decrease in second generation and mean fitness decrease in second generation as compare to first generation.

d) if fitness dont change, genetic make up of population remain the same in each generation.

Related Questions

Navigate

• Browse (All)
• Browse S
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.