Give scientific reasons for the following statements:
The chances of birth of a male child (son) or a female child (daughter) are equal.

Explanation

In human beings, the sex of the child is determined by the father. The father produces two types of sperms. Both the types of sperms are produced equally in number. `50%` of the total sperms produced contain X-sex chromosome. While the remaining `50%` of sperms produced contain Y-sex chromosome along with autosomes. The chances of each type of sperm to fertilise the ovum are therefore equal.
Hence, the chances of birth of a son or a daughter are equal.