You are seeing a 28-year-old man in clinic. He has long QT sydrome due to a mutation in the KCNH2 gene. He has two sons and a daughter. One son and his daughter have been tested and found to have the same mutation as him.
What is the chance that his younger son also has this mutation?
A. 0He is affected with a dominantly inherited condition. Therefore there is 1 in 2 chance for each child.