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Explain the sex determination mechanism ...

Explain the sex determination mechanism in humans. How is it different in birds ?

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(i) ln Birds female has dissimilar chromosomes (Zw) and male has two similar zz chromosome.
But in human female is homogametic (XX) and Male is heterogametic (XY)
(ii) In human the sperm is responsible for the sex of child but in bird egg is responsible for the sex of the chicks.
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