What causes one phenotype to be dominant and another recessive?

Question

What causes one phenotype to be dominant and another recessive?

In: 24

Answer 1

This doesn’t *cause* traits to be one or the other, but it’s related to

1. How prevalent is that trait in a population?

And

2. Does that trait make the thing that has it *more* successful at passing down its traits* or *less* successful at it?

*”passing down traits” == “making babies”