The sex-determining mechanism in humans is the XY type. Humans contain 23 pairs of chromosomes. 22 pairs of chromosomes are the same in both males and females, which are called autosomes. The 23rd pair is different in both sexes and is known as sex chromosome. Females have a pair of X chromosomes and males have X and Y chromosomes as sex chromosome.
- In humans, the females have XX sex chromosome while the males have XY chromosome.
- When the X chromosome of female unites with X chromosome of male, a girl will be born and when X chromosome of females unites with Y chromosome of male, a boy will be born.
- Thus, the sex chromosome of males (father) determines the sex of the child.