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Q.

In birds which gamete is responsible for the sex of chicks? 

(a) Sperm

(b) Ovum

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a

Ony (a)

b

Only (b)

c

Both (a) and (b)

d

Cannot be determined by gametes

answer is B.

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Detailed Solution

Female heterogamety is observed in birds. Ova may contain either Z or W chromosomes, while sperm contains only Z chromosome. They type of ovum that is fertilised is of importance.

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