marfan syndrome is an autosomal dominant disease that affects connective tissues in many parts of the body. Connective tissues provides strength, flexibility, and support to bones, ligaments and muscles. people suffering from Marfan syndrome experience heart issues and eye sight problems. a couple is interested in having a child, but suspect that one of them has the disease. they are worried about passing the disease to their children, so they go to a genetic counselor for advice. use the image below to help you determine the probability that, if they have a child, the child will have Marfan syndrome