When Thomas Hunt Morgan crossed his red-eyed F₁ generation flies to each other, the F₂generation included both red- and white-eyed flies. Remarkably, all the white-eyed flies were male. What was the explanation for this result? A) The gene involved is located on the Y chromosome. B) The gene involved is located on the X chromosome. C) The gene involved is located on an autosome, but only in males. D) Other male-specific factors influence eye colour in flies.

Question

Quizplus · Accepted Answer

The gene involved in the eye color is located on the X chromosome. Since males only have one X chromosome, they only inherit one copy of the gene responsible for eye color. If this copy has a mutation that causes white eyes, they will show the white-eyed phenotype. Therefore, all white-eyed flies in the F2 generation were male.

When Thomas Hunt Morgan Crossed His Red-Eyed F1 Generation Flies

When Thomas Hunt Morgan Crossed His Red-Eyed F₁ Generation Flies