Question

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

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 to their offspring because all their eggs carry an X chromosome. Males, on the other hand, have sperm that can carry either an X or a Y chromosome. If a sperm carrying a Y chromosome fertilizes an egg (which has an X chromosome), the resulting combination (\(XY\)) leads to the development of a male (son). If a sperm carrying an X chromosome fertilizes the egg, the combination (\(XX\)) results in a female (daughter). So, for a man to have a son, the sex - determining chromosome he must contribute is the Y chromosome.

Answer:

only Y