Why the sex of the body is usually determined at the time of fertilization, i.e., at the merger of the sperm and egg.

In humans, the Y chromosome plays a decisive role in determining sex. If the egg is fertilized by a sperm carrying the X chromosome, a female body develops. Therefore, women have one X chromosome from their father and one X chromosome from their mother. If the egg is fertilized by a sperm carrying the Y chromosome, a male organism develops. A man (XY) receives the X chromosome only from his mother. This is due to the peculiarity of the inheritance of genes located in the sex chromosomes.

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