A man and a woman decide to have a child. Draw a genetic diagram to explain why there is a 50% chance of...

3. A man and a woman decide to have a child. Draw a genetic diagram to explain why there is a 50% chance of the child being male.
4. A couple both have a history of cystic fibrosis in their families. Neither of them has cystic fibrosis themselves. Evaluate the use of embryo screening for this couple.