Question

The P- allele is recessive to the P+ allele at the P locus. The selection coefficient (s) against the P- allele at a locus is 0.80. If s was instead 0.10 at this locus, which of the following statements is true?

A.

The P- allele in the first case (s = 0.80) will be fixed faster than the P- allele in the second case (s = 0.10).

B.

The P- allele in the first case (s = 0.80) will be fixed slower than the P- allele in the second case (s = 0.10).

C.

The P- allele in the first case (s = 0.80) will be lost slower than the P- allele in the second case (s = 0.10).

D.

The P- allele in the first case (s = 0.80) will be lost faster than the P- allele in the second case (s = 0.10).

Answer 1

Relative Fitness is survival rate of genotype related to maximum survival rate of other genotypes in the population. Selection coefficient is measure of strength of selection against genotype.

Selection coefficient =1-relative fitness

Selection coefficient has value between 0 to 1. for example in a population selection coefficient for tt genotype is 0 it means that this genotype means tt genotype will be present in population and it's chances of its lost will be very less. It produce more offspring in comparison to other genotypes. On the other hand if selected coefficient has a value of 1 it means it's offsprings are not viable and is listing from population fastly.

So in this question selection coefficient initially 0.80 means that P allele will lost fastly in first case in comparison to second case where P has s= 0.10. so D) option will be the right choice of this question.