True, but the talent isn't as obvious. Similarly, you could have two very slow runners give birth to a fast runner, and most of their speed would ultimately com

True, but the talent isn't as obvious. Similarly, you could have two very slow runners give birth to a fast runner, and most of their speed would ultimately come down to getting the right recessive genes. Almost every trait, even willpower itself, is influenced by genetics. But for most traits it's very difficult if not impossible to reliably determine what genes influence what. Most things aren't determined by one gene, they're influenced by many genes, as well as randomness and your environment.