Why is having half the chromosome number in gametes necessary for genetic stability?
Answer and explanation
Correct answer: So that the normal chromosome number can be restored after fertilisation
The governing concept is reduction division and maintenance of chromosome number. In humans, body cells normally contain 46 chromosomes, whereas each gamete contains 23. During fertilisation, one sperm and one egg unite, so 23 + 23 restores 46 in the zygote. If gametes carried the full number, chromosome number would double in each generation. Therefore option A is correct.
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What is the correct answer to this question?
So that the normal chromosome number can be restored after fertilisation
Why is this the correct answer?
The governing concept is reduction division and maintenance of chromosome number. In humans, body cells normally contain 46 chromosomes, whereas each gamete contains 23. During fertilisation, one sperm and one egg unite, so 23 + 23 restores 46 in the zygote. If gametes carried the full number, chromosome number would double in each generation. Therefore option A is correct.
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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