Question

ZW - ZZ type of chromosomes are found in:

• A. Insects
• B. Humans
• C. Butterflies
• D. Birds

Hint:

In the ZW system (found in birds), the female (ZW) determines the sex of the offspring, which is the opposite of the XY system in humans where the male (XY) determines the sex.

Answer 1

The Correct Option is D

The ZW sex-determination system is found in birds, some reptiles, some insects (like butterflies and moths), and some fish. In this system, the female is the heterogametic sex (ZW), and the male is the homogametic sex (ZZ). This is the reverse of the XY system found in humans and many insects.