The way I understood evolution wasn't that "some mutations will have a positive impact", it's more like, when a species hits hard times, "some mutations allow it to survive long enough to reproduce".
Sure, you have dominant genes like eye colour. But evolutionary changes to a whole species are more about weeding out genes that cannot survive, right? Because if a species has no specific sexual selectors for breeding and all mutations survive and reproduce, then how does a specific gene thrive?
Edit: but chatting to my wife, she mentioned that species is a difficult concept, generally taken to be a generic group that actual mate in the wild. There are several different species that could technically produce offspring but through sexual selection, do not.
Sure, you have dominant genes like eye colour. But evolutionary changes to a whole species are more about weeding out genes that cannot survive, right? Because if a species has no specific sexual selectors for breeding and all mutations survive and reproduce, then how does a specific gene thrive?
Edit: but chatting to my wife, she mentioned that species is a difficult concept, generally taken to be a generic group that actual mate in the wild. There are several different species that could technically produce offspring but through sexual selection, do not.