How human male only responsible for the sex of a newborn child and female has no role in it?

This statement is scientifically incorrect. In human reproduction, both the biological male and female contribute equally to determining the sex of a newborn child. The sex of a newborn is determined by the combination of sex chromosomes inherited from both parents.

1. Biological Male Contribution:

- Each sperm cell produced by a biological male (man) carries either an X chromosome or a Y chromosome.

- The presence of a Y chromosome is required for male sex determination. If a sperm carrying a Y chromosome fertilizes an egg, the result is a male offspring.

2. Biological Female Contribution:

- Every egg cell produced by a biological female (woman) carries only an X chromosome.

- If a sperm carrying an X chromosome fertilizes an egg, the result is a female offspring.

Therefore, it is not accurate to claim that only the biological male is responsible for the sex of a newborn child. The inheritance of chromosomes from both parents determines the sex of the child through the presence or absence of the Y chromosome.