What combination will form when a Y-chromosome sperm fuses with an X-chromosome egg?
Answer and explanation
Correct answer: XY
The governing concept is the XX–XY mechanism of human sex determination. The egg contributes X, while the sperm specified in the question contributes Y. Their union therefore gives X + Y = XY. In the standard school classification, XY is the usual male chromosomal combination. XX would result from an X-bearing sperm, YY cannot form because the egg does not carry Y, and XO represents a different chromosomal condition rather than the stated fusion. Hence option B is correct.
Frequently asked questions
What is the correct answer to this question?
XY
Why is this the correct answer?
The governing concept is the XX–XY mechanism of human sex determination. The egg contributes X, while the sperm specified in the question contributes Y. Their union therefore gives X + Y = XY. In the standard school classification, XY is the usual male chromosomal combination. XX would result from an X-bearing sperm, YY cannot form because the egg does not carry Y, and XO represents a different chromosomal condition rather than the stated fusion. Hence option B is correct.
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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