Question

The sex chromosomes of both males and females are respectively

• A. YY, XX
• B. YX, XY
• C. XY, XX
• D. All of the above

Answer 1

The correct option is C

XY, XX

The correct option is C.

Explanation of the correct option:

1. X and Y are called sex chromosomes.
2. In each individual, there are a pair of sex chromosomes.
3. In males, it would be XY and in females, it would be XX.
4. During gamete formation, sperms formed are of two types, one with the X chromosome and the other with the Y chromosome.
5. While the ovum produced is with X chromosomes (since women are homogametic), the sperm might be X or Y bearing (as males are heterogametic).
6. So in the fusion of sperm with the ovum, there is a 50% chance whether the child is male or female.

Explanation of the incorrect options:

Option A:

The sex chromosomes of both males and females are respectively XY and XX and not YY and XX.

Option B:

The sex chromosomes of both males and females are respectively XY and XX and not YX and XY.

Final answer: The sex chromosomes of both males and females are respectively XY and XX.