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Q.
ZZ/ZW type of sex determination is seen in
Principles of Inheritance and Variation
Solution:
In birds and some reptiles both the sexes possess two sex chromosomes but Unlike human beings, the females contain heteromorphic sex chromosomes $(AA + ZW)$ while the males have homomorphic sex chromosomes $(A \sim \,$\ $+ ZZ)$. Because of having heteromorphic sex chromosomes, the females are heterogametic (female heterogamety) and produce two types of eggs, $(A+Z)$ and $(A+W)$. The male gametes or sperms are of the one type $(A+Z) .1: 1$ sex ratio is produced in the offspring. So the correct answer is 'Peacock'.