Yokan's professor probably described the Natural Selection theory.
A generation is a broad category for all individuals who were born and are still alive at around the same period.
The process by which communities of living creatures adapt and change is known as natural selection. there are people who are different and this means that people will be different in some ways but still have some characteristics that will be passed on from one generation to another.
Yokan's professor explained that about the natural selection of some genes.
Learn more about generation, here:
https://brainly.com/question/12841996
#SPJ1
