Problem:
A man's grandfather has galactosemia. This is a rare autosomal recessive disease caused by inability to process galactose, leading to muscle, nerve, and kidney malfunction. The man married a woman whose sister had galactosemia. The woman is now pregnant with their first child.
Required:
Question 1: Draw the pedigree.
Question 2: What is the probability that this child will have galactosemia?
Question 3: What is the probability that the second child will have galactosemia if the first child has it?
Any help would be greatly appreciated!