Yes, an obvious one is the inability to manufacture Vitamin C. Universal in great apes, including us, but every other animal and plant can do it, except guinea pigs.
I imagine that at some point our ancestors lived in a vitamin C rich environment, so losing this was no immediate handicap. But even then, the random drift should have taken ages. Is there some reason why losing this pathway would be a benefit?
Same for colour-blindness. Is it drifting, or is it actually good for something in an environment where it does no harm? (These poor children, none of them will ever be commercial pilots or qualified electricians....)
Yes, an obvious one is the inability to manufacture Vitamin C. Universal in great apes, including us, but every other animal and plant can do it, except guinea pigs.
I imagine that at some point our ancestors lived in a vitamin C rich environment, so losing this was no immediate handicap. But even then, the random drift should have taken ages. Is there some reason why losing this pathway would be a benefit?
Same for colour-blindness. Is it drifting, or is it actually good for something in an environment where it does no harm? (These poor children, none of them will ever be commercial pilots or qualified electricians....)