Question

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

Answer 1

Sex of a child in humans is determined by the type of male haploid gamete that fuses with the female egg. The chromosome in the ${23}^{rd}$ 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.