A normal cell in an adult woman has?

a. one functional X chromosome

b. two functional X chromosome

c. one functional Y chromosome

d. one X chromosome and one Y chromosome

e. three or more X chromosomes

The correct answer will be option-A.

Explanation:

The females carry two X-chromosomes in their cells but one of these X-chromosome gets permanently inactivated during embryonic development.

The X-inactivation is known as lyonization which ensures that only one functional X-chromosome should be present like in males. This process is a random process and therefore a female can have both the functional X-chromosomes and males can also have a functional X-chromosome.

Thus, option-A is the correct answer.