Scale color in dragons is controlled by a gene. The blue spot color gene is B and the yellow spot color gene is Y. 2 parents have baby dragons. They have blue spotted dragons, yellow spotted dragons, and yellow and blue spotted dragons. What are the parent genotypes that could make this cross and create the offspring?

YY x BY

BB x YY

BY x BY

BY x BB

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. 

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