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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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