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A woman of genotype xhxh mates with a man of genotype xhy. they have a daughter with the abnormal genotype xhxhxh. if nondisjunction occurred in the father, when did it occur and what was the genotype of the abnormal sperm

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mathmate
The maternal genotype is xhxh, so the mother can only contribute xh to the gamete, one way or another.
Therefore the father's contribution is xhxh (=genotype of sperm), which happens to be the result of nondisjunction.  Since xhxh is the result of nondisjunction of homologous chromosomes, it occurred in meiosis I.  

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