Not so fast there Itsy. We may not necessarily get the wild type Drosophila melanogaster . We're bound to run into them. That is what I meant. It's pretty easy to sex fruit flies, Itsy.
Male flies are often smaller than females.
The posterior end of their abdomens is darker and more rounded than those of females and they have black sex combs on their front legs which are very distinctive. The Sex Combs. You're not ready for the Comedy Club yet, Itsy. We can use the dissecting microscopes in here if we need any help in determining characteristics. No problemo, rabida.