John Paul

The a percentage of Monkey, zebra Fish, dog, wolf. Genetic don't lie. AND I USE PIGMENTATION TO DETECT THOSE MUTATIONS. BY CHANCE THE LIGHT-SKINNED FISH THAT I USED FOR THAT RESEARCH ALSO TAUGHT US A LOT ABOUT HOW HUMANS BECAME LIGHTER-SKINNED. NARRATOR: WHAT PROFESSOR CHENG DISCOVERED WAS PERHAPS ONE OF THE MOST IMPORTANT GENETIC MUTATIONS EVER FO