inbred

Like Trump, Carson had no particular attachment to the people he supposedly represented: He was a cosmopolitan Dublin-London gentleman, not a religious zealot or anti-Catholic bigot, and he found the inbred political culture of Protestant Ulster stultifying.

Not only that, but the pupfish are believed to be one of the most inbred of all species, a lack of genetic variation that makes it difficult for the creatures to procreate and thrive.

"Wildebeest that can no longer migrate have lower genetic diversity, are more genetically isolated and are more inbred. We expect this to lead to lower survival, reduced fertility and other negative effects on fitness," says Xiaodong Liu, one of the study's first authors and a postdoc at the Department of Biology.

In bees, males are typically haploid and have only one set of chromosomes, but when they're inbred, they can have two sets of the same chromosomes and lack genetic diversity.

More recently, studies have found the southern resident females have less hunting success than their neighbors up north and that the shrinking, increasingly inbred population of southern residents could be plummeting toward extinction.