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Why is meiosis significant for the maintenance

Why is meiosis significant for the maintenance of normal quantity of chromosomes of the species with sexual reproduction?

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A decrease to a half of the maximum normal quantity of chromosomes is obligatory in some stage of the life cycle of a species which reproduces sexually. When that could not occur in each generation, if a zygote is made by fusion of gametes there would be duplication in the amount of chromosomes in a geometric progression.

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