Of africa the molecular clock constant over all

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: o Adaption- something that enhances the survival and reproductive success of an organism in a particular environment. o Skin color not adaptive ▪ Adaptations to protect against skin cancer happen later in life, after reproduction, will not pass on to children ▪ Skin color is a side effect for selecting for something else, result of sexual selection o Skin color is adaptive ▪ Melanin pigmentation varies by latitude, darker skin protects against UVR, light skin absorbs more UVR ▪ Darker skin protects against the deleterious effects of UVR (e.g.,sunburn, damage to sweat glands, skin cancer) o Skin color measured by skin reflectance, higher reflectiveness lighter o Skin color from Melanin (natural sunscreen) ▪ Carotene (orange) ▪ Hemoglobin (red) o The history of skin color in the human lineage can be understood by looking at skin color in our close relatives. o MC1R gene ● “Melanocortin 1 receptor makes a protein that affects the color of skin and hair. At this locus, amino a...
View Full Document

Ask a homework question - tutors are online