The method of sex determination in birds is
A. XO
B. XY
C. ZX
D. XA
Answer: Option C
Solution (By Examveda Team)
The method of sex determination in birds is ZX.The sex chromosomes in birds are designated Z and W, and the male is the homomorphic sex (ZZ) and the female is heteromorphic (ZW). In most avian species the Z chromosome is large, usually the fourth or fifth largest, and it contains almost all the known sex-linked genes.

The options of this question are wrong.
Correct answer is ZZ for male and ZW for females.