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Old 11-06-2017, 10:30 AM
Location: Colorado (PA at heart)
9,637 posts, read 15,089,721 times
Reputation: 12693


Originally Posted by Crashj007 View Post
People who have lived in the same geographic region for many generations
may have some alleles in common, but no allele will be found in all members
of one population and in no members of any other.
This is the important part of the quote. No one is claiming that there ARE alleles found in all members of one population and in no members of any other. Ethnicity reports are clear about the fact that they are estimates, and largely based on statistical commonality - ie, alleles most commonly found in one population and rarely in others. And results have proven that on a continental level, it does wind up being fairly accurate. My entire family is of European descent and all 4 big testing companies have accurately identified us as primarily such (ie, 90-100% European). That's hardly a coincidence when millions of people have all had the same experience. This quote gives people the wrong impression - that taking a DNA test is going to tell you're mostly East Asian or African when you're actually European. That's just not the case - and millions of results have proven it. While it may not always be 100% accurate, and on a sub-continental level, it could be wildly inaccurate, there is a very high degree of reliability of it on a continental level.

You should really read the full statement: Minorities and Genomics: Issues of Race - it becomes rather clear that it's largely influenced by people's fears that such ethnicity testing will lead to discrimination.

Additionally, this statement is from a project that completed in 2003, 14 years ago! A lot has changed and advanced in this field since then.
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Old 11-06-2017, 10:37 AM
Location: Raleigh
8,135 posts, read 6,835,527 times
Reputation: 10005
Originally Posted by marino760 View Post
<>A lot can happen in 40,000 years. Climates can change a great deal in that amount of time.
Even if the ice age had not been severe enough to create the bridge, or the valley through the midst of the glacier area (another theory), certainly sea level would have been lower, and even a few feet of change would be enough to hide all the old coastal habitation sites.
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