Question

An unfertilized human ovum has:

• A. X and Y chromosomes
• B. X and X chromosomes
• C. X and Y chromosomes
• D. One X chromosome

Answer 1

The correct option is D One X chromosome

All human beings have 23 pairs of chromosomes in the nuclei of their cells. One pair of chromosomes is the sex chromosome i.e. X and Y.

A female has two X chromosomes, while a male has one X and one Y chromosome.

The gametes i.e. egg and sperm have only one set of chromosomes. The unfertilized egg always has one X chromosome, whereas, there are 3 types of male gametes, a few have X chromosomes and a few have Y chromosomes.

So, the correct answer is option D.