A person has a genomic mutation along the sex chromosomes, when the karyotype is 45, i.e., only one X chromosome is present

A person has a genomic mutation along the sex chromosomes, when the karyotype is 45, i.e., only one X chromosome is present in the body. Why aren’t there people with karyotype 45 who have only one Y chromosome?

X chromosome is transmitted from the mother. As a rule, the X chromosome does not have much significance in determining sex, but it is required, because it contains 1400 genes that are necessary for the normal life of the fetus. And in the chromosome there are factors that are associated only with the determination of sex. The chromosome has only 78 genes.

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