A zoologist found that in the population of frogs in SandraMacGregor’s pond, half the genes for skin color in the gene poolwere alleles for green spots, and half the genes were alleles forbrown spots. Which of the following could cause this 50:50proportion 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-spottedmales.
c. Green-spotted females prefer to mate with brown-spottedmales.
d. Filling in a pond across the street causes frogs to move into MacGregor’s pond.
