If a sperm carrying a Y chromosome fuses with the egg, what will be the sex of the child?
Answer and explanation
Correct answer: Male child
The egg always contributes an X chromosome, whereas a sperm may contribute either X or Y. When a Y-bearing sperm fuses with the X-bearing egg, the zygote has the chromosome combination XY. In the usual human sex-determination system, XY develops as a male child. Therefore, option B is correct. Option A would result from XX; options C and D do not describe this fertilisation outcome.
Frequently asked questions
What is the correct answer to this question?
Male child
Why is this the correct answer?
The egg always contributes an X chromosome, whereas a sperm may contribute either X or Y. When a Y-bearing sperm fuses with the X-bearing egg, the zygote has the chromosome combination XY. In the usual human sex-determination system, XY develops as a male child. Therefore, option B is correct. Option A would result from XX; options C and D do not describe this fertilisation outcome.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: Heredity and Evolution. Topic: Sex determination.
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