Answer:
This example illustrates the concept of a trait being multifactorial.
Explanation:
Saying that a trait is multifactorial means that such trait depends on multiple genes as well as multiple environmental factors that influence them. According to the passage, Jamal does have the genes to be a professional athlete. Yet, since his environmental conditions have never been favorable, he did not become one. Simply having the "right" genes was not enough; there were other factors in place as well. Therefore, this is an example of a trait being multifactorial.
