Jack's father was an All-American in the 50M backstroke and qualified for the Olympic Team. Jack is a freshman in high school and does not think that he will need to train to become a member of the school's swim team

Jack keeps telling you that his father was a great swimmer, so he will also be a great swimmer. What do you think?
He is correct; he will be a great swimmer no matter what he does.
It is unlikely that Jack even has the genotype for swimming.
Jack might have the genotype for swimming, but he will need to train to become a great swimmer.
Jack has also inherited the genes for any athletic sport.

Jack might have the genotype for swimming, but he will need to train to become a great swimmer.