What is heterogamety? Explain the mechanism of sex determination in Drosophila.
Either male or female individual produces two different types of gametes. Example- XO ( grasshopper) and XY (humans and drosophila) type in males or ZW (birds) type in females.
In Drosophila, the males have one X and one Y chromosome whereas females have a pair of X chromosomes besides autosomes.