Question

Which pair of organisms would NOT be expected to share the same sex determination system?

Options

• Ants and honeybees

• Humans and Drosophila

• Birds and butterflies

• Humans and grasshoppers

Answer 1

Humans employ the XX–XY sex determination system, while grasshoppers employ the XX–XO system. These are distinct mechanisms despite both being chromosomal systems. In contrast, humans and Drosophila both use XX–XY, birds and butterflies both use ZW–ZZ, and ants and honeybees both use haplodiploidy.