Mark's grandfather was an olympic gold medalist in swimming. what will determine if mark develops into an olympic swimmer

Genetics has an important part to play if Mark has a chance of becoming an Olympic swimmer. It would be beneficial if he inherited traits from his grandfather that are essential to develop into a good swimmer. These traits include large hands and feet, wide shoulders, slim hips and a high arm span to height ratio. With these traits and dedicated training Mark would have a chance of making it to the Olympics.