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Evolution of Skin Presentation

NCIIA/Epicenter student ambassadors Program http://epicenter.stanford.edu/student-ambassadors-program
by

Chae Chun

on 30 January 2013

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Transcript of Evolution of Skin Presentation

Surprises! SURPRISE! Show... Don't Tell Character Resolution TELLING stories Climax storyboarding The Evolution of Skin Melanin UVMED Let's look at the structure of stories
(a simple one) You can fit a story arc in under 1 minute... Conclusion - tribes on the western bank of red sea have darker pigmented skin than those on the eastern bank For example, the tribes on the western and eastern banks of the Red Sea - UV rays
- scattering of UV radiation
- originated from Africa
- production of melanin
- dark skin as protection Story Arc The Early Skin Color of Humans Focus how + why Structure of Stories Nancy Duarte whole video whole video the story of skin evolution Light Spectrum Sun Exposure Chimpanzees The Story of Skin Evolution "a B vitamin that is essential for cell growth and reproduction" -wordnetweb.princeton.edu/perl/webwn
- DNA synthesis
- neural tube deficiencies Folate Culture and Skin Evolution psst...click here Dangers of Migration What was the original skin color of the early hominids? - people move to areas with higher levels of UV radiation
- skin cancer
- premature skin aging

-people move to areas with lower levels of UV radiation
- rickets
- vitamin D deficiency "Any of a group of vitamins found in liver and fish oils, essential for the absorption of calcium and the prevention of rickets in children and osteomalacia in adults. They include calciferol (vitamin D2) and cholecalciferol (vitamin D3)"
- three vitamin D zones
- tropics, subtropics/ temperate regions, circumpolar regions
- women generally lighter skinned in all populations
- enables calcium absorption, development of the skeleton, and maintenance of healthy immune system 1. What caused the development of different shades of skin color?
2. How has this evolution of dark and light skin color enabled human survival?
3. In what way does the evolution of skin contribute to our understanding that race is not valid biologically, and also how humans evolved? Questions Light or dark skin? http://3.bp.blogspot.com/_j0hc4aNzY1M/TNnO5vlFJJI/AAAAAAAAA4A/i4M7uZZ9wC8/s1600/landscape.jpg http://3.bp.blogspot.com/_oxdp0IbqJrQ/Std7SED5tBI/AAAAAAAABhQ/qDvanoOvpPw/s400/human_evol.gif - early, active humans
1. stay cool
2. sweat glands and loss of hair
3. brain heat sensitive http://3.bp.blogspot.com/_oxdp0IbqJrQ/Std7SED5tBI/AAAAAAAABhQ/qDvanoOvpPw/s400/human_evol.gif - early human heel
- Neanderthals http://www.ablogabouthistory.com/wp-content/uploads/2011/02/heel.jpg http://www.agoosa.com/images/sun.jpg http://themoderngreen.com/wp-content/uploads/2008/10/light_spectrum.jpg http://www.uvir.co.za/Portals/0/images/02_UV_Light_Spectrum.gif Electromagnetic Spectrum - light color with dark hair
- facial pigmentation and UV radiation http://images.wikia.com/uncyclopedia/images/3/33/Chimpanzee-picture.jpg - reduces penetration of all wavelengths of light
- absorbs UV rays
- "natural sunscreen"
- skin color and pigmentation - minmum-erythemal dose http://webprod.hc-sc.gc.ca/nhpid-bdipsn/ingredReq.do?id=2932&lang=eng folic acid: https://sci9bestq3bm.wikispaces.com/Folic+Acid Vitamin D http://www.dermaharmony.com/skinnutrition/vitamind3.aspx http://www.hsph.harvard.edu/nutritionsource/vitamin-d/ - cultural behaviors influence modern evolution of skin http://thelma1.deviantart.com/art/Rainbow-Ocean-24693999 Map of Red Sea/ Saudi Arabia http://www.photographersdirect.com/buyers/stockphoto.asp?imageid=2667896 http://members.virtualtourist.com/m/p/m/10bc27/ www.virtualtripping.com http://www.cowfiles.com/gallery/african-garden www.ccidinc.org http://www.inetours.com/New_York/Pages/photos/Times-Square-day.html http://travelgems.co.za/2012/12/18/ultimate-antarctica-patagonia-cruise-4-jan-2014/adelie-penguins-clustered-on-an-iceberg/ http://dwpicture.com.au/picture.asp?picture=107692 http://www.tourisminbarcelona.com/fun-in-barcelona/barcelona-beaches/ http://casillasshowpro.blogspot.com/2012/09/cloudy-day.html What was the original skin color of the early hominids? Light or dark skin?
Early hominids most likely began with light skin, but developed darker skin. UVB= sun burn/ tan, skin cancer, skin aging
UVA= skin tanning, skin wrinkling, skin cancer
UVC= most dangerous, absorbed by ozone layer 1. What caused the development of different shades of skin color?
2. How has this evolution of dark and light skin color enabled human survival?
3. In what way does the evolution of skin contribute to our understanding that race is not valid biologically, and also how humans evolved/ are evolving? Caroline, Chae, Eliza, and Sirena
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