Question

if this man had a son, what sex chromosome did he give the son?
neither
only y
unknown
only x

Explanation:

In humans, biological sex is determined by sex chromosomes. Females have two X chromosomes (\(XX\)), and males have one X and one Y chromosome (\(XY\)). When it comes to reproduction, females can only contribute an X chromosome. Males can contribute either an X or a Y chromosome. If the offspring is a son (\(XY\)), the Y chromosome must come from the father. This is because the mother can only provide an X chromosome.

Answer:

only Y