Question

Which of the following organisms exhibits the XX–XY sex determination system?

Options

• Birds and butterflies

• Honeybees and ants

• Humans and Drosophila

• Grasshoppers and some insects

Answer 1

The XX–XY sex determination system is characteristic of humans, Drosophila, and most mammals. In this system, females possess two X chromosomes (XX) and are homogametic, while males possess one X and one Y chromosome (XY) and are heterogametic, determining the sex of offspring.