Which combination is necessary for the birth of a male child in humans?
Answer and explanation
Correct answer: X from the mother and Y from the father
The governing concept is the XX–XY pattern of human sex determination. A human egg normally contributes an X chromosome, whereas a sperm contributes either X or Y. When an X-bearing egg fuses with a Y-bearing sperm, the zygote has XY chromosomes, the usual male chromosomal combination. Therefore B is correct. The mother does not normally supply Y, so C and D are impossible, while A gives XX.
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What is the correct answer to this question?
X from the mother and Y from the father
Why is this the correct answer?
The governing concept is the XX–XY pattern of human sex determination. A human egg normally contributes an X chromosome, whereas a sperm contributes either X or Y. When an X-bearing egg fuses with a Y-bearing sperm, the zygote has XY chromosomes, the usual male chromosomal combination. Therefore B is correct. The mother does not normally supply Y, so C and D are impossible, while A gives XX.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: World of Living. Topic: Heredity and Evolution.
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