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4.Principles of Inheritance and Variation
normal
Barr body in mammals represents
A
All the heterochromatin in female cells
B
One of the two $X$ chromosomes in somatic cells of females
C
All the heterochromatin in male and female cells
D
The $Y$ chromosome in somatic cells of male
(AIPMT-1995)
Solution
(b)Barr body is nothing but ‘$X$’ chromosome which has become heterochromatic, thus appear as deeply stained body. Of the two ‘$X$’ chromosomes are remains normal while the other appears as a Barr body.
Standard 12
Biology
