In humans, which parent determines the sex of the child?
Father
In humans, females have two X chromosomes (XX) and males have one X and one Y chromosome (XY). During gamete formation, the mother can contribute only an X chromosome to every egg cell, while the father can contribute either an X or a Y chromosome through his sperm.
If a Y-bearing sperm fertilises the egg, the zygote is XY → boy. If an X-bearing sperm fertilises the egg, the zygote is XX → girl. Because the father alone determines which sex chromosome reaches the egg, it is the father who determines the sex of the child.
Hence, the correct answer is : Father.
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