The father contributes either an X or a Y chromosome to their child. The sex chromosome from the father determines the child's sex. If the father gives an X chromosome, the child will be genetically female. If the father gives a Y chromosome, the child will be genetically male.
Here is an explanation of how sex chromosomes determine sex:
- Females: Have two X chromosomes (XX).
- Males: Have one X and one Y chromosome (XY).
The mother always contributes an X chromosome. Therefore, the father's contribution determines the child's sex.
