If both the egg and the sperm contribute X chromosomes, what will be the sex-chromosome combination of the child?
Answer and explanation
Correct answer: Female child
The mother’s egg contributes one X chromosome, and in this case the father’s sperm also contributes X. Their union produces the combination XX: X + X = XX. In the standard human chromosomal model, XX corresponds to a female child, so option A is correct. A Y chromosome is absent in this combination, so it cannot be YY or XY, and fertilisation can still produce a zygote.
Frequently asked questions
What is the correct answer to this question?
Female child
Why is this the correct answer?
The mother’s egg contributes one X chromosome, and in this case the father’s sperm also contributes X. Their union produces the combination XX: X + X = XX. In the standard human chromosomal model, XX corresponds to a female child, so option A is correct. A Y chromosome is absent in this combination, so it cannot be YY or XY, and fertilisation can still produce a zygote.
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.
