Navigation Links
Skin color: Handy tool for teaching evolution
Date:2/20/2011

f moths or, the most commonly used evolutionary example, bacterial colonies, according to Jablonski. Adaptation to the environment through evolutionary change becomes even more interesting when looking at the mechanism of tanning.

"In the middle latitudes tanning evolved multiple times as a mechanism to partly protect humans from harmful effect of the sun," Jablonski told attendees at the annual meeting of the American Association for the Advancement of Science today (Feb. 20) in Washington, D.C.

Tanning evolved for humans so that when ultraviolet B radiation increases in early spring, the skin gradually darkens. As the sun becomes stronger, the tan deepens. During the winter, as ultraviolet B wanes, so does the tan, allowing appropriate protection against folate destruction but sufficient vitamin D production. Tanning evolved in North Africa, South America, the Mediterranean and most of China.

Natural variation in skin color due to natural selection can be seen in nearly every classroom in the U.S. because humans now move around the globe far faster than evolution can adjust for the sun. The idea that variation in skin color is due to where someone's ancestors originated and how strong the sun was in those locations is inherently interesting, Jablonski noted.

"People are really socially aware of skin color, intensely self-conscious about it," she said. "The nice thing about skin color is that we can teach the principles of evolution using an example on our own bodies and relieve a lot of social stress about personal skin color at the same time."

Jablonski noted that the ability to tan developed in a wide variety of peoples and while the outcome, tanablity, is the same, the underlying genetic mechanisms are not necessarily identical. She also noted that depigmentated skin also developed at least three times through different genetic mechanisms. Students who never tan, will also understand why they do not and that they never will.


'/>"/>

Contact: A'ndrea Elyse Messer
aem1@psu.edu
814-865-9481
Penn State
Source:Eurekalert

Page: 1 2 3

Related biology news :

1. Radiologists play key role in teaching physiology to medical students
2. Simple, ingenious way to create lab-on-a-chip devices could become a model for teaching and research
3. ASPBs Teaching Tools in Plant Biology receives Gold Award
4. Mississauga teacher awarded prize for excellence in teaching genomics
5. McMaster, NVIDIA establish first CUDA Teaching Centre in Canada
6. Teaching communication and information literacy skills
7. Ethical issues ignored in teaching, research of sustainability
8. American Sociological Association launches first-of-its-kind teaching tool
9. Physical education teaching staff play key role in making you like sport
10. UAB professors book promises solution for teaching evolution without conflict
11. K-State plant pathologists develop online teaching modules used globally
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:7/21/2015)... YORK , July 21, 2015 ... systems, as seen in the recent U.S. Office ... a solution to the infosec conundrum, but developers ... is stored. To address this dilemma, Biometrics-as-a-Service provider ... its Biometric Tokenization SDK for third party integration. ...
(Date:7/9/2015)...  Synaptics Inc. (NASDAQ: SYNA ), a leading developer ... report financial results for the fourth quarter and fiscal ... close of market. The company will host a corresponding ... PT (5:00 p.m. ET), during which management may discuss ... live call, analysts and investors should dial 888-455-2260 (conference ...
(Date:7/8/2015)... 8, 2015 Summary Pancreatic cancer is ... most fatal, with a mortality rate of 10.9 deaths ... pancreatic cancer patients has highlighted a significant need for ... being met by the current market. A highly ... with varying molecule types and mechanisms of action, which ...
Breaking Biology News(10 mins):HYPR Corp. Launches Industry First Biometric Tokenization Platform 2HYPR Corp. Launches Industry First Biometric Tokenization Platform 3HYPR Corp. Launches Industry First Biometric Tokenization Platform 4Synaptics to Report Fourth Quarter, Fiscal Year 2015 Results on July 30 2Frontier Pharma: Pancreatic Cancer - Identifying and Commercializing First-in-Class Innovation 2Frontier Pharma: Pancreatic Cancer - Identifying and Commercializing First-in-Class Innovation 3
... show that in the plant world, bigger isn,t necessarily better. ... that to be a good competitor in the forest, you ... Lonnie Aarssen. "But our research shows it,s virtually the other ... monopolize sunlight, water and other resources, limiting the number of ...
... a "heart healthy" diet and maintaining or increasing participation in ... abilities as we age, according to new research reported today ... (ICAD 2009) in Vienna. "We can,t do anything ... us that there are lifestyle decisions we all can make ...
... University (NTU),s Assistant Professor Li Hoi Yeung, Assistant Professor ... important contribution to the understanding of the process that ... as ,apoptosis, or programmed cell death, is a normal ... million cells a second. According to Professor Li, ...
Cached Biology News:Smaller plants punch above their weight in the forest, say Queen's biologists 2A 'heart healthy' diet and ongoing, moderate physical activity may protect against cognitive decline 2A 'heart healthy' diet and ongoing, moderate physical activity may protect against cognitive decline 3A 'heart healthy' diet and ongoing, moderate physical activity may protect against cognitive decline 4A 'heart healthy' diet and ongoing, moderate physical activity may protect against cognitive decline 5A 'heart healthy' diet and ongoing, moderate physical activity may protect against cognitive decline 6Study by NTU professors provides important insight into apoptosis or programmed cell death 2
(Date:7/29/2015)... ... July 29, 2015 , ... Nearly everyone has heard of the ... people realize that a rich source of these cells is teeth—baby teeth that come ... need to be pulled to make room for braces. These potent stem cells ...
(Date:7/28/2015)... ... ... 530 sample changer for vials can be used with Anton Paar density meters, viscometers ... mPas (internal air) up to 36,000 (external air) – and can process up to 71 ... is its removable magazine, which is easily lifted off its hub and carried by hand ...
(Date:7/28/2015)... , July 28, 2015 Seahorse ... cell metabolism, is the provider of XF Technology ... all disease research areas. As the links between ... into cell metabolism is escalating rapidly.   ... by the Nature Publishing Group (NPG) featuring XF ...
(Date:7/28/2015)... 21, 2015 Research and Markets ( ... "Biomedical Refrigerators and Freezers Market - Global ... 2014 - 2022" report to their offering. ... freezers market has been segmented based on applications: ... and others. The others segment includes applications of ...
Breaking Biology Technology:Advanced Oral and Maxillofacial Surgery (AOMS) in Elmhurst, IL Partners with Provia Labs to make Store-A-Tooth™ Dental Stem Cell Banking Available to their Patients 2New Moves in Automatic Sample Handling: Introducing Xsample 530 2XF Technology Used to Demonstrate Feasibility of Stem Cell Regenerative Technique 2XF Technology Used to Demonstrate Feasibility of Stem Cell Regenerative Technique 3Biomedical Refrigerators and Freezers Market Report - Global Industry Analysis 2015 2Biomedical Refrigerators and Freezers Market Report - Global Industry Analysis 2015 3
... Sigma-Aldrich(R) (Nasdaq:,SIAL) announced the release of ... Glycoproteomics and Glycomics, a laboratory reference,for life ... http://www.newscom.com/cgi-bin/prnh/20080221/AQTH004A ), The new 2008 Glycobiology ... 1st edition (2004) by including more topics,important ...
... Have Entered into an Agreement Under, Which Genmab Will Acquire ... ... COPENHAGEN, Denmark and REDWOOD CITY, California, February 21, Genmab ... announced today that they have entered into an agreement,under which ...
... Feb. 21 Phlo Corporation,(Pink Sheets: PHLC) (the ... ended December 31, 2007 of $190,072 and $320,256,respectively, ... nine-month,periods ended December 31, 2006 of $3,100 and ... and $315,533 for the three and,nine months ended ...
Cached Biology Technology:New Glycobiology Analysis Manual 2nd Edition Provides Valuable Resource for Novices and Experts in the Field 2Genmab and PDL BioPharma Sign Purchase Agreement for Antibody Manufacturing Facility 2Genmab and PDL BioPharma Sign Purchase Agreement for Antibody Manufacturing Facility 3Genmab and PDL BioPharma Sign Purchase Agreement for Antibody Manufacturing Facility 4Genmab and PDL BioPharma Sign Purchase Agreement for Antibody Manufacturing Facility 5Phlo Reports Sharp Revenue Increase 2
... amino acid synthetic peptide whose sequence is derived from bovine ... to carboxy terminus): C - S(338) - K - ... V - A - P - A(348). This ... the polyclonal antibody that reacts with this product and bovine ...
... more than doubles the benefits of high ... analysis cycles of the standard binary system ... tandem mode. Difficult separations are dramatically improved ... heartcut configurations, on-line sample preparation is fully ...
... Components in this kit are prepared with ... Biochains Mitochondria Isolation Kit is designed ... a fast and easy way. One kit ... 100 isolations (enriching mitochondria from 10 ...
... DNA preparations are prepared from customers ... 1mg to multi-gram scales. Small-scale ... preparations are made according to customer ... according to customer needs, and glycerol ...
Biology Products: