A) sex chromosome of female
B) sex chromosome of male
C) autosome of female
D) autosome of male
Correct Answer: A
Solution :
Sex chromatin body was discovered by Canadian geneticists Murry L. Barr and E.G. Bertram in interphase nerve cell of female cats. Sex chromatin is named ?Barr body? after its discovered M.L. Barr. Barr body is a highly condensed structure. It lie against the nuclear membrane of the interphase cells of females. One of the two X-chromosomes of a normal female becomes heterochromatic and appears as Barr body. Barr body is absent in males. So male is sex chromatin negative.
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