I disagree with this analysis. Look at the Hispanics/Mestizo people. They are a mix of European Spaniards and indigenous Native American indians. While their skin is obviously more fairer than Native Americans' skin, they still have tan skin; not skin that is very fair at all. There are also (although rare) there are also Hispanics who have blonde hair; from the European admixture. But it is darker than the blonde hair seen in European white people; and is more of a light brown.
It's not something with which you can disagree. It's what happens with admixture.Everything depends on the numbers involved, as well as the degree of intermarriage and whether the incoming group brought their own women. In genetics parlance, the question is whether it was an elite male migration again. Let's give it one more try...
Every situation is specific. In north America, the indigenous peoples were not very numerous. In addition, they fell prey to European specific diseases, and many of them were killed in conflicts with the settlers. There was some intermarriage despite all of this. Those admixed children who were absorbed by the Europeans look European. Those who remained with the indigenous peoples look "mostly" indigenous, but their dna tells the story. Perhaps it was that dna which protected them against these diseases.
In countries like Bolivia and Peru where the indigenous tribes remained isolated, the intrusive "West Eurasian" haplotypes indeed appear, but the people still look very indigenous.
In countries like Mexico, the indigenous people were very numerous. Most Mexicans are "mixed", anywhere from 40-60% European from what I can remember from genetic studies. They look what they are...mixed...both in features and in pigmentation. Of course, in the upper classes there will be people who are predominantly European. In the lower classes there will be people who are predominantly "Indian". In out of the way areas like the Yucatan, they will be predominantly "Indian" in genetic markers and appearance. In a country like Argentina or in pockets of Brazil, you still have people who are either 100% European or 90% European, and they look it.
The same rules hold true for African Americans. The amount of SSA ancestry can range from a few percent to about 20% as an average, although some have close to 50% European ancestry. Vanessa Williams and Dr. Gates obviously have a lot, and it shows. As it does in Cory Booker. Dr. Gates, indeed, has both a European yDna marker (R1b) and a European mtDna marker.
http://ecx.images-amazon.com/images/I/71zDtevrYsL._SL290_.jpg
http://cache.boston.com/bonzai-fba/Third_Party_Photo/2009/07/20/gates1__1248117974_8015.jpg
http://d35brb9zkkbdsd.cloudfront.net/wp-content/uploads/2012/05/CoryBooker.jpg
The African ancestry in most African Americans is from Nigeria.
http://www.okayafrica.com/wp-content/uploads/nigeria-student-protest-2012-6-1-11-1-56-620x413.jpg
This isn't rocket science Melancon, which leads me to ask about the purpose of these posts.
If you're truly interested, there are a number of recent papers on the subject. The largest on admixture in new world populations is this one from 23andme.
http://blog.23andme.com/23andme-research/dna-usa-2/