Why is it necessary for reproductive cells to have half the chromosome number?
Answer and explanation
Correct answer: So that after fertilisation the normal total number is restored
During sexual reproduction, one sperm and one egg fuse during fertilisation. If each gamete has half the diploid number, 23 + 23 gives the normal human zygote number of 46. Meiosis produces these haploid gametes, and fertilisation restores diploidy. This prevents chromosome number from doubling in every generation, so option A is correct; the other choices misrepresent the purpose of meiosis.
Frequently asked questions
What is the correct answer to this question?
So that after fertilisation the normal total number is restored
Why is this the correct answer?
During sexual reproduction, one sperm and one egg fuse during fertilisation. If each gamete has half the diploid number, 23 + 23 gives the normal human zygote number of 46. Meiosis produces these haploid gametes, and fertilisation restores diploidy. This prevents chromosome number from doubling in every generation, so option A is correct; the other choices misrepresent the purpose of meiosis.
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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