Explain the biological meaning of meiosis. Why does reduction division occur only during sexual reproduction?

The biological meaning of meiosis is the formation of haploid nuclei or cells, which fuse during sexual reproduction, and the diploid set is restored in the zygote. This process provides a constant set of chromosomes in newly formed organisms during sexual reproduction.
If the indicated reduction did not occur, then in the zygote (therefore, in all cells of the daughter organism), the chromosomes would become twice as large. However, this contradicts the rule of constancy of the number of chromosomes.

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