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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.

Related tags

GametesChromosome-NumberFertilisationHeredity And EvolutionWorld Of LivingScienceClass 10 Mcq

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