A) 0
B) 1
C) 2
D) 3
Correct Answer: B
Solution :
Down?s syndrome is a chromosomal abnormality in humans and is associated with an extra chromosome 21 (i.e. chromosomal formula is 45 + xx = 47), while one of the two x-chromosomes becomes genetically inert and heteropycnotic and forms the Barr body. Hence human female suffering from Down?s syndrome contains (2x - 1 = 1) one Barr body.You need to login to perform this action.
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