A single ovum of a human being contains:

Explanation

The correct answer is that a single ovum of a human being contains an X chromosome. This is because the ovum is a haploid cell, meaning it contains only one set of chromosomes, specifically an X chromosome. Human females have two X chromosomes (XX), and during the formation of gametes, one of these X chromosomes is passed on to the ovum. Other options are incorrect because:XX - chromosomes: This configuration is found in diploid cells, not haploid cells like the ovum.YY - chromosomes: Such a combination is not naturally occurring in human biology.XY - chromosomes: This is the typical male chromosome configuration, which is not found in the ovum.