Question

In human males, the sex chromosomes present are XY. What is the difference between them?

• A. There is no difference in size.
• B. Y chromosome has more genes than X chromosome.
• C. X-chromosome is bigger, whereas Y is smaller.
• D. Y chromosome is bigger, whereas X is smaller.

Answer 1

Answer:

C. X-chromosome is bigger, whereas Y is smaller.

• X chromosome (females have two of them, while males have one) is five times larger than the Y chromosome.

• Not to stir up a battle of the sexes, but the X chromosome (females have two of them, while males have one) is five times larger than the Y chromosome, and has 10 times the number of genes.

• That means it carries more traits — and diseases — than the Y chromosome.