Thomas Hunt Morgan, working with fruit flies, discovered that male fruit flies could have the mutant trait of white eyes, even if they had only one "white allele. What was the significance of this finding?
A) It led to the discovery of aneuploidy.
B) It led to the discovery of polyploidy.
C) It led to the finding that only males have Y chromosomes.
D) It proved that crossing over occurs between the X and Y chromosomes.
E) It allowed him to assign the trait of eye color to the X chromosome.

Question

Quizplus · Accepted Answer

Morgan's discovery was significant because it provided evidence for the chromosome theory of inheritance, specifically showing that the gene for eye color in fruit flies is located on the X chromosome. This was one of the first clear demonstrations of a trait being linked to a specific chromosome.

Thomas Hunt Morgan, Working with Fruit Flies, Discovered That Male