The enzyme glucose-6-phosphate dehydrogenase (G6PD) deficiency is inherited as a recessive gene on the X-chromosome in humans. Below is a pedigree of a family affected by G6PD.
II-2 has a child with a man that is not affected by G6PD deficiency. She is pregnant with their first child. Genetic tests that her child is a boy. What is the probability that her male child will have G6PD deficiency?