Why is the number of chromosomes in the karyotype of most species of living organisms even?

The number of chromosomes in a somatic cell must be clear so that it can be divided into two (in a germ cell there are two times less chromosomes than in a somatic one).

Human karyotype – 46 chromosomes, but human germ cells contain 23 chromosomes.

If a person had 45 chromosomes in the karyotype, then how many would there be in the genitals? It is clear that not 22.5, because the number of chromosomes must be whole.

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