Bird females have chromosome arrangement as

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(C) In birds,sex is determined by a morphologically dissimilar pair of chromosomes called sex chromosomes.$Z$ and $W$ are the two sex chromosomes foun

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$ZW$

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(C) In birds,sex is determined by a morphologically dissimilar pair of chromosomes called sex chromosomes.$Z$ and $W$ are the two sex chromosomes found in birds.$A$ male bird has a $ZZ$ (homogametic) arrangement,while a female bird has a $ZW$ (heterogametic) arrangement of chromosomes.Therefore,the female bird has the $ZW$ chromosome arrangement.

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