That would be terrible! If there was some mutation, environmental issue like flood or other challenge that shifted the ecosystem of one and there was an overpopulation or depletion of a species everything would be shifted.
Survival of the fittest kills off a weak link in a species. If a flawed or inferior organism prospered, it could be a mess.
Having said that, with the stated question, it would be an unlikely development due to the cell structure. Humans need sun and are in it but too much is not desirable. Additionally, study of the ...
The idea of utilizing chloroplasts in humans is discussed.