MSFinals-1558

A 35-year-old man undergoes genetic testing after he develops colorectal cancer at the age of 35. His mother also had colorectal cancer at a similar age and died from the disease. He undergoes genetic testing and is found to have classic familial adenomatous polyposis (FAP) coli. He has a 3-year-old son.
If his son has inherited classic FAP and does not undergo prophylactic surgery, what is the likelihood he will develop colon cancer?