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?

Explanation

Cell type of male fruit fly - XY Female fowl - ZW
The sex chromosomes are different, hence, they are called heterogametic.
While female fruit fly has XX and male fowl has ZZ. The sex chromosomes are similar hence homogametic.