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"Causing genetic bottleneck?"

Some effect, no doubt.

Professor Bryan Sykes says that the Europeans were driven back to the Ice Age Refuges during the Younger Dryas. Professor Stephan Oppenheimer says that some European populations outside the refuges weathered the YD in place...so, there's some disagreement among experts.

Now, some genetists say that the Sa'ami's (Laplanders) left the refuges early at the end of the Ice Age and were isolated from the larger European population for a long time...I wonder if that isolation wasn't during the YD. The Sa'ami are so unique that they are described as having a Sa'ami Motif.

"It is curious, however, that the mitochondrial DNA of the Samis should differ so distinctly from that of other European peoples. The "Sami motif" which has been identified by researchers - a combination of three specific genetic mutations - is shared by more than one third of all tested Samis, but of all the gene tests conducted throughout the world, the same mutation has occurred in only six other samples, one Finnish and five Karelian."

Hmmm ~ could 'splain some whopping huge orthodontist bills ~ could have bought a Lexus.

Large teeth tend to splay out if the upper jaw is "smaller". This results in the lower teeth achieving a crooked alignment.

Best bet is to restrict breeding to those with larger upper jaws.

Prognathism is no guide to jaw size though ~ just to its position vis a vis the skull.

Here's Winston Churchill's denture:

While a student he went to Lapland to run around, eat the food, live the life for something like 6 months! It's worth reading about his health and that of his father to make you wonder if he/they weren't suffering from being forced to eat a Western diet rather than the high iron reindeer and seal for which they might have been designed.

Linnaeus did the same thing on a grant ~ went to Lapland to study plants and animals.

I think you asked if there were any figures on Sa'ami native intelligence ~ depends on who you count as a Sa'ami. Can't find the diminutive Norwegian Sa'ami in Churchill's woodpile, but I suspect he's there ~ his brand of heart trouble with repeated "attacks" is fairly typical of what you can find among those who inherited one of the genes for Scandinavian porphyria. His father's health problems are certainly typical.

"Professor Bryan Sykes says that the Europeans were driven back to the Ice Age Refuges during the Younger Dryas. Professor Stephan Oppenheimer says that some European populations outside the refuges weathered the YD in place...so, there's some disagreement among experts."

Can you recommend a good book on this sort of stuff that is simultaneously mainstream, but includes this sort of degree of controversy, w/ maybe some more controversial stuff thrown in?