When Thomas Hunt Morgan crossed red-eyed F1 generation flies to each other, the F2 generation included both red- and white-eyed flies, but all the white-eyed flies were male. Which of these best explains Morgan's result?

Question

Quizplus · Accepted Answer

The gene for eye color in Morgan's experiments is located on the X chromosome. Since males have only one X chromosome, a single recessive allele (like that for white eyes) will express the trait, explaining why only males showed the white-eyed phenotype.

When Thomas Hunt Morgan Crossed Red-Eyed F1 Generation Flies to Each