Question

 1. How does sustained directional selection affect the amount of genetic variation within a population?

 A. The amount of genetic variation increases.

 B. The amount of genetic variation decreases.

 C. The amount of genetic variation stays the same.

 2. Which of the following hypothetical populations is most likely to be mating assortatively at the M locus? Numbers refer to observed percentages of each genotype.

 A. 81 MM, 18 Mm, 1 mm

 B. 25 MM, 50 Mm, 25 mm

 C. 20 MM, 20 Mm, 60 mm

 D. 20 MM, 60 Mm, 20 mm

Answer 1

1. correct answer is option (A)

The amount of genetic variation increases

Genetic diversity is increases as it result in the development of more variations.Because of variations only organism able to adapt to the new environment.All other option are not correct .

Therefore correct answer is option (A)

2)The correct answer is 81MM,18Mm,1mm

correct answer is option (A)

If mating is random then all the genotypes would be almost equal.When you compare all the options for all the 3 genotypes it is clear that in option (A)homozyhous recessive is not favoured means recessive trait organisms are not involved much in mating this is possible only when selected mating takes place.Therefore all other option are not correct .

Hence correct answer is option (A)