Gujarati
Hindi
4.Principles of Inheritance and Variation
easy

Bird females have chromosome arrangement as

A

$XY$

B

$XO$

C

$WZ$

D

$WW$

(AIIMS-2009)

Solution

In birds sex is determined by morphologically dissimilar pair of chromosomes called sex chromosomes. $Z$ and $W$ are two sex chromosomes of birds. A male bird has $ZZ$ (homogenetic sex) arrangement while a female bird has $ZW$ (heterogenetic sex) arrangement of chromosomes. Number of chromosomes in birds is $69$.

Standard 12
Biology

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