Question

3. How many Barr bodies are seen in the somatic cell of individual suffering from Turner's
syndrome?
a. 1
b. 2
d. 0
c. 3​

Answer 1

Answer:

d.0

Explanation:

Women have two X chromosomes out of which one is active and the other is tightly folded or heterochromatic. Under the microscope, it appears as a Barr body. The number of Barr bodies in humans is one less than the total number of X-chromosomes. A female suffering from Turner syndrome has 45 chromosomes instead of 46 chromosomes and the karyotype is 44+X.

So, number of Barr bodies = Total no. of X chromosomes - 1 i.e. 1-1 = 0