Question

how the sex of the human child is determined

Answer 1

If the Y chromosome in the male fuses with the X chromosome present in the female, the offspring would be a boy (XY). But if the X chromosome in the male fuses with the X chromosome present in the female then the offspring would be a girl (XX).

Answer 2

A baby sex is determined at the time of conseption when the baby is conceived,a chromosome from the sperm cell,either x or y fuses with the x chromosome in the egg cell,d determining whether the baby will be a female{xx} or a male {xy}