The probability the a male inherited his Y chromosome from his maternal grandfather is?
The probability that the male inherited his Y chromosomes from his maternal grandfather is zero (none). Male’s maternal grandfather means, the father of his mother. His mother inherited one X chromosome from her mother and one X from her father. As his Y chromosome is not inherited in her, it can not be inherited to the male we are concerned. The Y chromosome of the male has come from his father only and not his maternal grandfather. So the probability is zero for this.
