why do gametes have half the usual number of chromosomes?

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Solution

Gametes are produced as a result of meiosis which is reductional division. When two gametes belonging to opposite sexes combine then the chromosome number is restored back. Thus halving of the chromosome number in gametes maintains the chromosome number of a species.

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Question 29
Why do all the gametes formed in human females have an X chromosome?

Statement 1 (S1): The gametes or sex cells have only half the number of chromosomes compared to other cells in the body.

Statement 2 (S2): Mitosis gives rise to gametes.

why do sex cells have only half no. Of chromosomes than other cell.

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