Different breeds of common domesticated animals such as horses and dogs clearly show different behaviour, instincts, social relationships and similar, due to their biological inheritance. Still they can easily mate with other breeds of the same species. This also applies to wild animals, for example the wolfs living in the rainforest on the Canadian west coast prey on fish (and are maybe expected, with time, to go through a similar transformation as the predecessor to dolphins, that where actually wolf like animals, did when they resettled to the oceans) while inland wolfs prey on moose and elk etc, which requires completely different hunting technique, tactics, pack size and so on.
Are there any similar examples for humans? I reckon that living in the jungle or in the desert or on Greenland should reward different behaviours/traits that influence behaviour. Also going from a hunter-gatherer society to an agricultural society should reward different behaviours, social skills and similar aspect of human life.
Are humans like other animals in this respect (any examples?) or are we unique (?) in the animal kingdom when it comes to the influence of genetics on our behaviour?
One reason I ask is that I got second hand (without sources) information claiming that the natives of Mexico has the highest prevalence, of any population measured, of genes that are known to be connected with/causing ADHD. Mexico was also one the last places on the planet where humankind settled.
The argument went something like this: "during prehistoric time individuals with ADHD tendencies tended to be more adventurous than their peers and therefore traveled further". If this is true, people in Mexico's behaviour should be slightly different from people in current Kenya and Tanzania (by many scientists claimed to the birthplace of humankind), at least if you measure ADHD related traits.