Why are males said to be heterogametic?

Why is Drosophila male fly referred to as heterogametic?

The male fruit fly and female fowl are heterogametic while the female fruit fly and the male fowl are homogametic. Why are they called so?

Name two organisms where males are heterogametic.

Name an example of organsim, where females are heterogametic.

In human, males are heterogametic and females are homogametic, Explain. Are there any examples where males are homogametic and feamles heterogametic?

Differentiate male and female heterogamety.

At puberty the male is with deeper voice?