A) If both the assertion and the reason are true and the reason is a correct explanation of the assertion
B) If both the assertion and reason are true but the reason is not a correct explanation of the assertion
C) If the assertion is true but the reason is false
D) If both the assertion and reason are false
E) If the assertion is false but reason is true
Correct Answer: A
Solution :
In most birds, the females are heterogametic (designated as Z W) and males are homogametic (designated as Z Z). The females produce two types of eggs (A + Z) and (A + W). The male gametes or sperms are of one type (A + Z), 1 : 1 sex ratio is produced in the offspring.
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