I am color-blind (though I prefer to call it color-confused because the issue with color blindness is not being able to see color, but rather not being able to differentiate color). I have issues with red-green-brown and blue-purple-gray.
I was forthright about the disability on my application to one of the schools I was admitted to (Western) but didn't mention it to the others. I really don't think it is going to affect me too much. I survived micro with a professor who was colorblind (he also wrote one of my LORs) and I plan to bring it up with Davis to get it documented in case I need someone special to assist me (in labs or exams) by tell me if something is green or brown, blue or purple, that kind of thing...
It's been a tough road in the sciences - more frustrating than anything else - because most professors teach as if everyone can see color. Sometimes it helps to remind them that colorblindness exists.
Oh...and I'm female, so, if you took genetics, you know exactly how rare that is 😀