Question

Study this figure and answer the question. F is represented by

• A. ZZ
• B. WW
• C. ZO
• D. ZW

Answer 1

The correct option is D ZW

Sex determination in birds is of ZW-ZZ types in which females are heteromorphic (ZW) and males have homomorphic sex chromosomes (ZZ). Thus, in the given image, A represent female sex chromosomes “ZW”. The heterogametic females forms two types of gametes “8+Z” and “8+W”. Fusion of egg carrying W chromosome with sperm (Z) produces 16+ZW (female); thus B refers to “W” and “F” refers to “ZW”. Fusion of egg carrying Z chromosome with sperm (Z) produces 16+ZZ (male); thus C refers to ‘Z”. Correct answer is D.