In Drosophila the Y chromosome is not required for male sex determination.However,it is required for :

Question

Quizplus · Accepted Answer

The Y chromosome in Drosophila is not required for male sex determination because the ratio of X chromosomes to autosomes determines sex in this species. However, the Y chromosome is required for male fertility. This is because the Y chromosome harbors genes necessary for spermatogenesis, the process by which sperm are produced. Without these Y-linked genes, males are sterile.

In Drosophila the Y Chromosome Is Not Required for Male