Question

A zoologist found that in the population of frogs in Sandra MacGregor’s pond, half the genes for skin color in the gene pool were alleles for green spots, and half the genes were alleles for brown spots. Which of the following could cause this 50:50 proportion to change over time? Select all that apply.

a. A drought shrinks the pond so that only six frogs remain.

b. Brown-spotted females prefer to mate with brown-spotted males.

c. Green-spotted females prefer to mate with brown-spotted males.

d. Filling in a pond across the street causes frogs to move in to MacGregor’s pond.

Answer 1

Frogs generally the spots on the frog skins helpd them to survive in a particular enviournment or condition.The spot colour is the result of some special pigment on the skin. And over time the total population become 50:50 poportion.

a. Drought results shrinking of the pond so it is possible that the all frogs may have escaped from the pond and only six remains among the total population.So this option may be applied.

b. Brown spotted females prefer to mate with brown-spotted males,is possible as this would results the total popualation 50:50 size.So this option is applicable.

c. If the Green-spotted females mate with the brown-spotted then the population size will not be 50:50 poportion.So this option is not applicable.

d. Filling up the pond can cause the frog to move in to MacGregor’s pond,may be possible but it can cause disrupt the total population size,so the Green and Brown spotted frog population size will not be 50:50 size.So this option is not applicable.

So the correct options are: (a) & (b)