purifying

He, as I noted in Standing Room Only, has embraced fascistic logic that crashing the economy would be a purifying ritual that would supposedly allow him and Trump to rebuild from the ashes, but of course, actual economists think that view is completely unfeasible.

Take Trump’s obsessions with good genes and bad genes and couple them with his remarks about “purifying the blood” of the nation by removing the human poison and other human vermin.

However, it is still subject to purifying natural selection -- an evolutionary force that protects its genetic information by removing harmful mutations.

"So why hasn't the Y chromosome disappeared, as some previous hypotheses suggested? In collaboration with Sergei Kosakovsky Pond from Temple University and others, we found that the Y chromosome still has a number of genes evolving under purifying selection -- a type of natural selection that keeps gene sequences intact. Many of these genes are important for spermatogenesis. This means that the Y chromosome is unlikely to disappear any time soon."

The researchers explored a variety of factors that could explain variation on the Y chromosome within gorillas and within chimpanzees, and this analysis revealed additional signatures of purifying selection on the Y. This confirms the role of this type of natural selection on the Y, as was discovered in their previous analyses of genes.