Download Skin Color Factors

Skin Color Factors
Melanin - Pigment in skin, eyes, hair
 Carotene - a copper-colored pigment
 Skin Thickness
 Reflection of Blood Vessels
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Skin Color Distribution
Why? Natural Selection
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Reduces frequency of skin cancer
Reduces likelihood of severe sunburn
which interferes with sweating
Melanin screens sunlight passing through
skin
– Regulates Vit. D. Production
– Which Regulates deposition of Calcium
Too Much> Calcification of soft tissues
Too Little> Rickets; Reduced Size of
Birth Canal