Which of the following statements about the X and Y chromosomes in humans is correct?

• A. The X chromosome contains more genes than the Y chromosome.
• B. Both X and Y chromosomes are of equal size and gene content.
• C. Females typically have one X and one Y chromosome.
• D. The Y chromosome is present in both males and females.

Answer: (A)

Verified step by step guidance

1. Understand the basic differences between the human sex chromosomes: X and Y chromosomes determine biological sex in humans.
2. Recall that the X chromosome is significantly larger than the Y chromosome and contains many more genes.
3. Remember that females typically have two X chromosomes (XX), while males have one X and one Y chromosome (XY).
4. Recognize that the Y chromosome is only present in males and carries genes important for male sex determination and spermatogenesis.
5. Evaluate each statement based on these facts to identify the correct one: the X chromosome contains more genes than the Y chromosome.