Question

The sex of drosophila is determined by

• A. The number of X - chromosomes divided by the number of autosome set
• B. Chromosomes X and Y
• C. The proportion of X - chromosomes pair to autosome pairs
• D. Whether or not the egg is fertilized and develops parthenogenetically.

Answer 1

Answer:

A. The number of X - chromosomes divided by the number of autosome set

• In drosophila, the X:A ratio, or the number of X chromosomes to the number of set top autosomes, is the most important factor in determining sex.