Which feature of gametes is necessary to keep the chromosome number normal after fertilisation?
Answer and explanation
Correct answer: Having half the chromosome number
In a diploid organism, body cells contain two sets of chromosomes. Meiosis produces haploid gametes containing one set, or half the somatic chromosome number. During fertilisation, one male and one female gamete fuse, so their two haploid sets restore the normal diploid number. If gametes were diploid, the chromosome number would double in each generation. Therefore option A is correct; options B, C, and D do not maintain genetic continuity.
Frequently asked questions
What is the correct answer to this question?
Having half the chromosome number
Why is this the correct answer?
In a diploid organism, body cells contain two sets of chromosomes. Meiosis produces haploid gametes containing one set, or half the somatic chromosome number. During fertilisation, one male and one female gamete fuse, so their two haploid sets restore the normal diploid number. If gametes were diploid, the chromosome number would double in each generation. Therefore option A is correct; options B, C, and D do not maintain genetic continuity.
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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