What combination will form when an X-chromosome sperm fuses with an X-chromosome egg?
Answer and explanation
Correct answer: XX
The governing concept is chromosomal sex determination in humans. The egg contributes one X chromosome, and the stated sperm also contributes one X chromosome. Adding the two contributions gives X + X = XX. In the standard school-level XX–XY system, XX is the usual female chromosomal combination. XY would require a Y-bearing sperm, YY cannot result because the egg supplies X, and OO is not a human sex-chromosome combination. Therefore A is correct.
Frequently asked questions
What is the correct answer to this question?
XX
Why is this the correct answer?
The governing concept is chromosomal sex determination in humans. The egg contributes one X chromosome, and the stated sperm also contributes one X chromosome. Adding the two contributions gives X + X = XX. In the standard school-level XX–XY system, XX is the usual female chromosomal combination. XY would require a Y-bearing sperm, YY cannot result because the egg supplies X, and OO is not a human sex-chromosome combination. Therefore A 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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