Question
Biology Question on Principles of Inheritance and Variation
Barr body is missing in the female suffering from
A
Huntington?? disease
B
Tay-sach?? disease
C
Klinefelter?? syndrome
D
Turner?? syndrome
Answer
Turner?? syndrome
Explanation
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?? 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?? syndrome.