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Principles Of Inheritance And Variation

Question
CBSEENBI12047618
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Which of the following is not related to sex chromosome X or Y?

  • Turner's syndrome

  • Klinefelter's syndrome

  • Down's syndrome

  • Haemophilia and colour bindness

Solution

C.

Down's syndrome

Down's syndrome is not related to sex chromosome X or Y. It is due to the trisomy of 21st chromosome. The main characteristics are mental deficiency, short stature, round face, flaccid muscles, small ears, protruding tongue and epithelial folds over the eyes.

Some More Questions From Principles of Inheritance and Variation Chapter

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