Who decides the sex of the baby mother or father? Explain with a flow chart?

In the case of the human, the male individual possesses sex chromosome (XY) in addition to their normal autosome, similarly female individual contains XX chromosome as sex chromosome along with their number of autosomes. It is therefore thought that genes for femaleness is associated with the X chromosomes and genes for maleness are on Y chromosomes. Hence, the presence of the Y chromosome is a must for the determination of sex of the male person. When fertilization takes place between a sperm carrying the X chromosome and an egg cell with the X chromosome; then, the developed zygote will contain an XX combination, the child will be a girl. If a sperm carrying Y chromosome unites with an egg cell containing the X chromosome then the zygote will carry XY chromosome and the child will be a boy.

Hence, it can be concluded that the sex of the baby is depended on the father.