Genetic admixture didn't begin in the 1970s, when insulin became the first government approved genetically modified organism (GMO) and AquAdvantage salmon, where an Atlantic salmon expresses a natural gene from a Chinook salmon to grow faster, certainly was not the first time such genetic engineering showed benefits across the ecosystem.
A new study finds that genetic admixture occurred in polar bears 100,000 years, but it did not create Frankenbears, it just created better brown bears.