Glucose-6-phosphate dehydrogenase deficiency (G6PD)is inherited as a recessive allele of an X-linked gene in humans.A woman whose father suffered from G6PD marries a normal man.
(a)What proportion of their sons is expected to be G6PD?
(b)If the husband was not normal but was G6PD deficient,would you change your answer in part (a)?