In the formation of baby boy or baby girl, mother does not have the main role. why?

The gender or sex of the child is determined by the chromosome pairs delivered by the parents.

The formation of a boy or girl will be dependent on the chromosome delivered by the male parent.

The sex determination in the child can be explained by:

1. Females have XX chromosomes. The chromosomes are purebred and the female will only contribute to the transmission of the X chromosome to the offspring.

2. Males have XY chromosomes. The chromosomal pair is heterozygous, and there is a 50-50 chance, that the chromosome delivered by the male parent to the offspring can either be X or Y.

3. The genotype or the sex of the child is determined by the type of chromosome contributed by the male parent.

Thus, the woman does not have a main role in determining the sex of the child.

To know more about sex determination, refer to the following link:

link