Question

Many moths and butterflies exhibit which type of chromosomal sex determination?

Options

• ZO–ZZ type

• ZW–ZZ type

• XX–XY type

• XX–XO type

Answer 1

The ZO–ZZ type is found in many moths and butterflies. The female (ZO) is heterogametic, producing A+Z and A+O ova, while the male (ZZ) is homogametic, producing only A+Z sperms.