How is the sex of the child determined in human beings?

Sex of child in humans is determined by the type of male haploid gamete that fuses with the female egg. The chromosome in the 23rd pair of a male gamete can be either X or Y. The female egg always has an X chromosome. So if the male gamete with the X chromosome fuses with the female egg, the child will be female. Similarly if the male gamete with the Y chromosome fuses with the female egg, the child will be male.

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