Provide a brief answer for the given question:
Explain how the chromosomal composition determines the sex of a newborn in humans.
a. In women, there are , making them a perfect couple. But in men, one is an X chromosome of normal size, while the other is a short Y chromosome.
b. The hereditary chromosome determines the sex of the child in humans.
c. The zygote becomes a when it inherits the X chromosome. The zygote becomes male if the zygote inherits the Y chromosome. So, .