very interesting topic and information...
i'll simply add that from my research:
we are all truly one race! variations in epidermal melanin and other phenotypic features are do almost exclusively to geographic location and
respective histories on those locations. our environments pressured external changes, but interestingly, we all; regardless of race, contain great
amounts of melanin internally (in the brain, nervous system etc.)
caucasoid (european) and mongoloid (asian) races necessarily derived from the africoid (african) race over time and due to environmental pressures.
all humans can trace their heritage to africoid (black african) parents in africa approximately 250,000 yrs ago (first modern human). mongoloid and
caucasoid races began to develop after african migrations from the continent; no more than 40-50,000 yrs ago. emerging as new races no greater than
10-30,000 yrs ago. but we are all reflections of the ONE race... the human race

