Q. 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
Explanation
If there are more than one X-chromosome then one X-chromosome remains active, while the other one becomes inactive and condenses to form Barr body. Barr body is a sex chromatin particle. Barr bodies can be used as a sex marker always occur in numbers one less than the total number of X-chromosomes.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.