A population of birds on the coast of California range in size from 9 cm to 15 cm. Another population of the birds exists on the distant island of Catalina off the same coastline, but all of these birds are 15 cm. What is the most likely explanation for the difference in sizes among the birds? mutation
disruptive selection
founder effect
bottleneck effect

The answer would be c, white eyes are homozygous recessive. in the early 1900s, morgan conducted several experiments with vinegar  flies (drosophila). one  sample revealed an anomaly: a  white-eyed, single male fly. he attempted to breed this fly with the typical red-eyed females. the offspring were all red-eyed. using flies from this new generation (brother-sister pairs)  produced some red-eyed and a few white-eyed flies. the white-eyed were all male. in later experiments, he was able to produce white-eyed females. this proved that white eyes are not lethal to either sex (ruling out a and b). since the percentage of white eyes to red eyes is so low, white eyes are not a dominant trait. it would be a recessive trait.