Comment Re:evolution fixes everything? (Score 1) 235
Evolution is a messy business all right. I know some about cystic fibrosis though because both of my brothers children were born with it. The CF gene is carried by about 1 person in 29 but it affects only those that have 2 CF genes. It's a double recessive so it only effects a much smaller percentage of the population.
I don't know a lot about genetics though beyond what you read in mainstream media so I can't say for sure why it doesn't evolve out of our species. My guess though would be that there isn't very much of that kind of evolutionary pressure on humans. We can coddle the sickly with our communities and doctors. Somehow I don't think most nearsighted (like me) neandrathals lasted too long yet we still have nearsighted people. Introduce a lot of chaotic violence and war into a society though and the sick , elderly and handicapped sure are at a disadvantage. I agree with you though that there is a lot more to be learned about genetics and why things have evolved the way they have.