In humans, the sex of a child is mainly determined by what?
Answer and explanation
Correct answer: The sex chromosome present in the father's sperm
Human eggs normally carry an X chromosome, whereas sperm may carry either X or Y. Fertilisation by an X-bearing sperm usually produces an XX zygote, and fertilisation by a Y-bearing sperm usually produces an XY zygote. Thus the sperm’s sex chromosome determines the chromosomal combination, although biological development is more complex than a simple label. A is correct; the other factors do not determine chromosomal sex.
Frequently asked questions
What is the correct answer to this question?
The sex chromosome present in the father's sperm
Why is this the correct answer?
Human eggs normally carry an X chromosome, whereas sperm may carry either X or Y. Fertilisation by an X-bearing sperm usually produces an XX zygote, and fertilisation by a Y-bearing sperm usually produces an XY zygote. Thus the sperm’s sex chromosome determines the chromosomal combination, although biological development is more complex than a simple label. A is correct; the other factors do not determine chromosomal sex.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: Heredity and Evolution. Topic: Sex determination.
Student feedback
Was this question useful?
👍 0 Helpful 👎 0 Not helpful
Yes 0% No 0%
0 responsesStudent Reviews
No published reviews yet.
