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Based on Lyon's hypothesis, what will be...

Based on Lyon's hypothesis, what will be the number of Barr bodies found in a human female suffering from Down's syndrome

A

0

B

1

C

2

D

3

Text Solution

Verified by Experts

The correct Answer is:
B
Down's syndrome is a chromosomes abnormality in humans and is associated with an extra chromosomes 21 ( i.i e chromosomes formula is 45 + XX = 47), while one of the two X-chromosomea are remains noraml while the other appears as a barr boby . Hence human female dufering from Down's syndrome contians `(2X - 1 = 1)` one Barr body .
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