"Why is the *exact same* mutation responsible for the fact that people, chimps, gorillas and other great apes can't synthesize ascorbic acid (vitamin C)?" This is a red herring. None of the mammals synthesizes ascorbic acid; they all get it from primarily vegetable sources. Felines and bovines for example, get theirs from green grass, while primates (and fowel) tend to get theirs mostly from fruits. We actually can get ascorbic acid from beef that has grazed only on green grass, and it is also present in raw whole milk, but pasteurization destroys it.
This is a red herring. None of the mammals synthesizes ascorbic acid; they all get it from primarily vegetable sources. I see. Then how do you account for the fact that endogenous Vitamin-C synthesis has actually been observed in non-primate mammals, and the biochemistry of this process is well understood?
Yet again, don't make the error of mistaking your presumptions for reality.
[Kids, this is your brain on creationism...
]
ances to you are twisted by your insistance in clinging to the completely disproven religion of evolution (otherwise known as the "I-can-have-any-kind-of-sex-I-want-to" faith.
Oooookay...