Melanin provides a crucial filter for solar UV radiation and its genetically determined variation influences both skin pigmentation and risk of cancer. Genetic evidence suggests that the acquisition of a highly stable melanocortin 1 receptor allele promoting black pigmentation arose around the time of savannah colonization by hominins at some 1—2 Ma. Here, I suggest that data on age-associated cancer incidence and lethality in albinos living at low latitudes in both Africa and Central America support the contention that skin cancer could have provided a potent selective force for the emergence of black skin in early hominins. It is increasingly being recognized that evolutionary considerations can shed light on our vulnerability to many common diseases [ 1 , 2 ]. Mismatches between the ancestral human environments that shaped our genetics and current lifestyles provide an evolutionary logic for some of the recognized risk factors for cancer [ 3 — 5 ]. A neglected aspect of these considerations is whether cancer could itself have provided selective pressure for evolutionary change in humans.
ALBINISM: Beauty Unseen
Albino Woman photos, royalty-free images, graphics, vectors & videos | Adobe Stock
Selecting a region may change the language and promotional content you see on the Adobe Stock web site. A link to set your password has been sent to: To access your purchases in the future you will need a password. We found a license history, credits, or subscription plan in your personal profile. Would you like to transfer them to your business profile? Don't show again Get started. Find Similar:. My Libraries.
Morning Picdump 50 pics. These two girls from Kazakhstan defied the odds. Lately, women's dreadlocks have been unpopular, though they were an incredible pleasure just a few years ago. This extraordinary hairstyle is very often seen on the female representatives of the resor. Last week I posted a list of various animals with albinism.
All rights reserved. A scientist argues that once we were all white; then we were all black; then some of us went back to white. When it comes to skin color, the idea that we're really all the same isn't just a utopian dream. A look at skin cancer from an evolutionary perspective suggests that maybe once we were all white; then we were all black; then some of us went back to white.