Why is the chance of a male and female child generally considered nearly equal?
Answer and explanation
Correct answer: Because the two types of sperm are produced with nearly equal probability
In the standard human XX–XY system, every egg contributes X, while sperm are produced as X-bearing or Y-bearing types. If these two types are generated and participate in fertilisation with approximately equal probability, XX and XY zygotes also have approximately equal expected probabilities. This is a population-level expectation, not a guarantee for every family or a result controlled by the mother.
Frequently asked questions
What is the correct answer to this question?
Because the two types of sperm are produced with nearly equal probability
Why is this the correct answer?
In the standard human XX–XY system, every egg contributes X, while sperm are produced as X-bearing or Y-bearing types. If these two types are generated and participate in fertilisation with approximately equal probability, XX and XY zygotes also have approximately equal expected probabilities. This is a population-level expectation, not a guarantee for every family or a result controlled by the mother.
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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