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B
XO
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C
WZ
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D
WW
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Solution
The correct option is C WZ In birds, sex is determined by morphologically dissimilar pair of chromosomes called as 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.