Boyfriend suspects he has higher chance of having a son?

Patient

Q: In my boyfriend's family there had been 5 generations of just males. He therefore suspects that he might have a condition where he can only produce male sperm - does this exist? I know this sounds ridiculous but I'm just curious.

Symptoms:  5 generations of males?
Doctor

A:   Hello,
There is no such condition and likelihood as the male sperm has both X and Y alleles. There is equal likelihood that any one of them would fertilise the X allele ovum making it either XX ( FEMALE) or XY( male) FETUS. So, it is a natural selection and there is no such entity as to that it is genetically related , it is purely a matter of natural selection.
I hope i have answered your query,
wishing you good health,
regards

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