Question

Which organisms utilize the ZW–ZZ sex determination system?

Options

• Birds, some reptiles, and butterflies

• Honeybees, ants, and wasps

• Grasshoppers and some insects

• Humans, Drosophila, and most mammals

Answer 1

The ZW–ZZ system is utilized by birds, some reptiles, and butterflies. In this system, males possess two Z chromosomes (ZZ) and are homogametic, while females possess one Z and one W chromosome (ZW) and are heterogametic, meaning females produce two different types of eggs (Z and W).