BIOLOGY 1101 Lecture Notes - Lecture 12: Melanin, Allele Frequency
4 Oct 2016
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Polygenic trait: a trait that is influenced by many different gene. Most traits that we observe are a result of several genes, not one. More than one protein create the phenotype we observe. Multiple proteins can have an additive or mixing effect. Melanin: a group of molecules responsible for coloration of skin, hair, and eyes, also found in many other places including the brain, not just humans. The concept of race, biologically speaking, has no backing o. race was interchangeable with species in the natural sciences until the 19th century. Evolution of skin pigmentation video o o. Skin color was important to differentiate between humans. Rejected that human pigmentation was due to climate: nasa. Uvb is important for the body but can be destructive. Darker skin is highly protective against uv rays. Doctors have not been good at warning people about the dangers of too little solar radiation: migration.
