In Drosophila melanogaster, the gene for eye color is located on the X chromosome. The allele for red eye color (X^w+) is dominant over the allele for white eye color (X^w). You examine a vial of 100 flies that are all offspring from a single genetic cross. You see only red-eyed females present, but you see both red-eyed and white-eyed males present. The genotypes of the parents were ____.

Question

Quizplus · Accepted Answer

Since all females are red-eyed and there are both red-eyed and white-eyed males, the mother must have been heterozygous for the eye color gene (carrying both the red and white alleles) and the father must have had the red allele. This scenario is only possible with the genotypes given in option D.

In Drosophila Melanogaster, the Gene for Eye Color Is Located