Why is the chromosome number different in body cells and gametes?
Answer and explanation
Correct answer: Gametes have half the number so after fertilisation the number remains normal
In humans, ordinary body cells are diploid and contain 46 chromosomes, arranged in 23 pairs. Gametes are produced by meiosis and are haploid, containing 23 chromosomes. During fertilisation, the egg and sperm nuclei fuse, restoring the diploid number of 46 in the zygote. Thus option A is correct; chromosomes are neither absent nor doubled in gametes, and they are not destroyed during fertilisation.
Frequently asked questions
What is the correct answer to this question?
Gametes have half the number so after fertilisation the number remains normal
Why is this the correct answer?
In humans, ordinary body cells are diploid and contain 46 chromosomes, arranged in 23 pairs. Gametes are produced by meiosis and are haploid, containing 23 chromosomes. During fertilisation, the egg and sperm nuclei fuse, restoring the diploid number of 46 in the zygote. Thus option A is correct; chromosomes are neither absent nor doubled in gametes, and they are not destroyed during fertilisation.
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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