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Q. Barr body is missing in the female suffering from

AIIMSAIIMS 2015Principles of Inheritance and Variation

Solution:

In normal females, number of Barr bodies is one less than the number of X chromosomes. One Barr body means the female has two X chromosomes. Turner’s syndrome (44 + X0) is a genetic disorder that affects only females. In this condition, cells of the affected female possess only one X chromosome, instead of two. Due to the presence of only one X chromosome, no Barr body is present in females suffering from Turner’s syndrome.