Question

Study this figure and answer the question. What would B and C represent?

• A. Z only
• B. W only
• C. Z and W
• D. WW

Answer 1

Answer: (C)

Z and W

Sex determination in birds is of ZW-ZZ types. Here, the females are heteromorphic (AA+ZW). Due to presence of two type of sex chromosome (ZW), female birds produce two types of gametes (heterogametic). Half gametes with (A+Z) and half with (A+W). Hence, B and C represent the sex chromosome of female namely Z and W. Correct option is C.