The Enzyme Glucose-6-Phosphate Dehydrogenase Deficiency (G6PD)is Inherited as a Recessive

Short Answer

The enzyme glucose-6-phosphate dehydrogenase deficiency (G6PD)is inherited as a recessive gene on the X chromosome in humans.A phenotypically normal woman (whose father had G6PD)is married to a normal man.
a) What fraction of their sons would be expected to have G6PD?
b) If the husband had G6PD,would it make a difference in your answer in part (a)?