787 pages on this wiki. Mark Andrew Spitz (born February 10, 1950) is a retired American swimmer. He won seven gold medals at the 1972 Summer Olympics, an achievement only surpassed by Michael Phelps who won eight golds at the 2008 Olympics.Spitz set new world records in all seven events in which he competed, a record that still stands.87 pages on this wiki. Mark Andrew Spitz (born February 10, 1950) is a retired American swimmer. He won seven gold medals at the 1972 Summer Olympics, an achievement only surpassed by Michael Phelps who won eight golds at the 2008 Olympics.
The colour of the skin is determined by the concentrations of three main pigments: melanin, carotene and haemoglobin. These are found in the dermis and combine to produce the pigmentation of all surface tissues including the skin, mucous membranes, and even the eyes.
Variation in genes and skin color. One gene responsible for the production of melanin pigment is SLC24A5. It is found that there are two variations of SLC24A5: 1) One variation is with the amino acid called threonine, which is responsible for the light color of the skin.he pigment that gives color to your skin is melanin. It is also responsible for the color of your eyes. Melanin protects our skin from harmful ultraviolet radiation of the sun by absorbing the rays. More melanin pigment is produced by people with dark skin as compared to light skinned persons.