Answer:
b. Barr body
Explanation:
In human females, each cell has two X chromosomes. However, one of these X chromosomes becomes inactivated in each cell. This inactive X chromosome condenses into a structure called a Barr body. The Barr body is essentially a deactivated X chromosome that is not actively used by the cell. This process ensures that females, despite having two X chromosomes, have the same dosage of X-linked genes as males, who have only one X chromosome.
