ANTH 242 Lecture Notes - Lecture 8: Light Skin, Gene Flow, Melanin
Document Summary
Can be useful in some plant and animal species. How many divisions do you make: human variation iis continuous. Discordant variation: population model: identify breeding populations, see what traits they share, use this to construct human groups. Problem: lack of reproductive isolation: clinal model: genetically inherited traits gradually change in frequency from one geographic area to another. Alice bruse (1954) plotted gene frequencies in 215 populations-balancing selection implicated. Acclimatization: occurs after short term exposure to a situation: examples: skin color immediate tanning with exposure to. Adaptation: individual has been exposed to a condition their entire life; change usually occurs during growth: bioplasticity: body has potential to do many types of things to come out with different types of morphology, examples: Examples: skin color amount of melanin produced without uv stimulus to make skin darker. Bajau fisherman: guy swimming under water to catch fish. Darker skin near the equator and at high altitude correlated with high levels of uv radiation.
