why it is necessary for the sperm and ovum to have one set of chromosomes
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Like you are asking that why curd cannot be made without lactobacillious bacteria.
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sperm and ovum has one set of chromosomes because they are haploid cells when they fuse they'll give rise to a diploid cell .
the need of haploid cells is that if they are diploid then when they fuse the new individual will have 92 chromosomes which is not possible and can affect life.
Explanation:
hence when two 23 chromosomes each from sperm and ovum fertilise the offspring will get a normal 46 chromosomes in each cell
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