Which of the following is true about Drosophila males?
They have two X chromosomes
They have one X chromosome
They have no X chromosomes
They have one Y chromosome
In Drosophila, males have one X chromosome and one Y chromosome. Females have two X chromosomes. The ratio of X chromosomes to the number of sets of autosomes (A) determines sex in Drosophila, with a ratio of 1:1 resulting in a female and a ratio of 1:2 resulting in a male.
Option 2 is the correct answer.