With the exception of identical twins, all of us are genetically different. BUT, we clearly have traits in common with others.
Humans like to classify based on race and can make the terminology sound scientific, but they are labels used for categorizing and discrimination. Clearly distinct biological races do not exist but that doesn't preclude the fact that our species is lacking anatomical and physiological variation.
Non-african peoples can have dark brown skin - Papua New Guinea - North of Australia
This is due to natural selection rather than shared descent.
CLINAL Distributions - are progressive, continuous gradations from one geographic region to another. Yellow brown hair among Australian aborigines shows a progressive gradation from one end of the continent to the other. This is due to selective pressures and mate selection.
DISCONTINUOUS Distributions - are non-continuous pockets of differences due to migration, genetic drift, gene flow, and closed breeding populations.
For more information and pics, see
O'Neil, D. (2011). Models of Classification: Anthropology Tutorials [website]. Retrieved from http://anthro.palomar.edu/tutorials/biological.htm
American Anthropological Society. (2011) History: The Story of Race. Retrieved from http://www.understandingrace.org/history/timeline_movie.html October 16, 2011.
- Maleness, Femaleness
- Similar origin in world, similar skin and facial features, body shape, stature
- Similar genetic components
- Environmental influences
- Nutritional influences
Humans like to classify based on race and can make the terminology sound scientific, but they are labels used for categorizing and discrimination. Clearly distinct biological races do not exist but that doesn't preclude the fact that our species is lacking anatomical and physiological variation.
Non-african peoples can have dark brown skin - Papua New Guinea - North of Australia
This is due to natural selection rather than shared descent.
CLINAL Distributions - are progressive, continuous gradations from one geographic region to another. Yellow brown hair among Australian aborigines shows a progressive gradation from one end of the continent to the other. This is due to selective pressures and mate selection.
DISCONTINUOUS Distributions - are non-continuous pockets of differences due to migration, genetic drift, gene flow, and closed breeding populations.
For more information and pics, see
O'Neil, D. (2011). Models of Classification: Anthropology Tutorials [website]. Retrieved from http://anthro.palomar.edu/tutorials/biological.htm
American Anthropological Society. (2011) History: The Story of Race. Retrieved from http://www.understandingrace.org/history/timeline_movie.html October 16, 2011.
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