Who Determines the Sex of the Baby - Father or Mother?

The sex of a baby is determined by the chromosomes they inherit from their parents. A baby's sex is determined at the moment of fertilization, when an egg from the mother is fertilized by a sperm from the father.

The egg from the mother always contains an X chromosome, while the sperm from the father can contain either an X or a Y chromosome. If the sperm that fertilizes the egg carries an X chromosome, the baby will be female (XX). If the sperm carries a Y chromosome, the baby will be male (XY).


Therefore, it is the father who determines the sex of the baby, as he provides either an X or Y chromosome in the sperm. The mother's egg always contains an X chromosome, so the baby will always inherit an X chromosome from the mother.

It is important to note that the sex of the baby is not determined by the mother's body or any actions she takes during pregnancy. The mother's body provides the necessary environment for the fertilized egg to grow and develop.

In summary, the sex of the baby is determined by the chromosomes inherited from the father, specifically whether the sperm carries an X or Y chromosome. The mother's egg always contains an X chromosome, but the baby's sex is determined by the chromosome from the father.

Popular Posts