Afrikaner population of Dutch settlers in South Africa is d…

 Afrikaner population of Dutch settlers in South Africa is descended mainly from a few colonists. Today, the Afrikaner population has an unusually high frequency of the gene that causes Huntington’s disease, because those original Dutch colonists just happened to carry that gene with unusually high frequency. This is an example of 

BONUS: The native residents of Basque country in the western…

BONUS: The native residents of Basque country in the western part of the Pyrenees Mountains between France and Spain still speak remnants of Euskera, a language the first European settlers brought in more than 10,000 years ago. The Basques have unusual frequencies of cetain ABO and Rh blood types, rare mitrochondrial DNA sequences and cell surface antigen patterns and a high incidence of a mild form of muscular dystrophy. So is this an example of ___________________.