Regarding the myth of all-white genes, please see http://www.pbs.org/race/000_General/000_00-Home.htm, the PBS series titled RACE: The Power of An Illusion which states in part:
"Humans cannot be subdivided into races...There isn't a single characteristic, trait - or even one gene - that can be used to distinguish all members of one race from all members of another...
Modern humans - all of us - emerged in Africa about 150,000 to 200,000 years ago. Bands of humans began migrating out of Africa only about 70,000 years ago. As we spread across the globe, populations continually bumped into one another and mixed their mates and genes. As a species, we're simply too young and too intermixed to have evolved into separate races or subspecies.
So what about the obvious physical differences we see between people? A closer look helps us understand patterns of human variation:
...most traits - whether skin color, hair texture or blood group - are influenced by separate genes and thus inherited independently one from the other. Having one trait does not necessarily imply the existence of others. Racial profiling is as inaccurate on the genetic level as it is on the New Jersey Turnpike...
Certainly a few gene forms are more common in some populations than others, such as those controlling skin color...but are these markers of "race?" They reflect ancestry, but...that's not the same thing as race..."
"Humans cannot be subdivided into races...There isn't a single characteristic, trait - or even one gene - that can be used to distinguish all members of one race from all members of another...
Modern humans - all of us - emerged in Africa about 150,000 to 200,000 years ago. Bands of humans began migrating out of Africa only about 70,000 years ago. As we spread across the globe, populations continually bumped into one another and mixed their mates and genes. As a species, we're simply too young and too intermixed to have evolved into separate races or subspecies.
So what about the obvious physical differences we see between people? A closer look helps us understand patterns of human variation:
...most traits - whether skin color, hair texture or blood group - are influenced by separate genes and thus inherited independently one from the other. Having one trait does not necessarily imply the existence of others. Racial profiling is as inaccurate on the genetic level as it is on the New Jersey Turnpike...
Certainly a few gene forms are more common in some populations than others, such as those controlling skin color...but are these markers of "race?" They reflect ancestry, but...that's not the same thing as race..."