alleryIf an egg carrying X fuses with a sperm carrying Y, what will be the sex chromosome make-up and sex of the resulting child?
AXX, female
BYY, male
CXY, male
DXX, male
Answer & Solution
Correct answer: C. XY, male
1. The egg contributes one X chromosome.
2. The sperm in this case contributes a Y chromosome.
3. Combining them gives the pair XY.
4. An XY individual develops as a male.
5. A YY combination cannot form because the egg always supplies an X, which rules out option B.
6. So the child is XY and male, option C.
_Source: Samacheer Kalvi (TN SCERT) Class 10 Science, Unit 18 Genetics "Sex Determination in Human", p.276_
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