in birds, is the sperm or the egg responsible for the  of the chicks?

I think you are asking about sex determination in birds. If so here is the answer-

In birds, males have same sex chromosomes (ZZ) and females have different sex chromosomes (ZW). So the sex of the offspring is determined by the egg,not by sperms.

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the egg i guess

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i hope u have got what i asked..

cz certain words are not allowed to write .. i mean error!
 

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