Molly Przeworski Profile picture
Evolutionary Geneticist, Columbia University
Sep 14, 2021 25 tweets 5 min read
I keep reading versions of the statement that genetic differences within a human population have no implications for genetic differences between populations, alongside strong statements about what we know about the causes of differences within a population. 1/n It got me thinking about how that distinction is not well defined, for many reasons: principally because (i) “populations” are an abstraction and not a real thing and (ii) that abstraction hides huge amounts of environmental variability… 2/n
Jan 25, 2021 11 tweets 3 min read
A new thread about @arbelharpak and my paper on the evolution of group differences in changing environments, now out in @PLOSBiology:… 1/n Complex trait variation arises from both genetic and environmental effects and complex traits evolve under the influence of both. Yet as human population geneticists, we sometimes ignore environmental effects or implicitly assume that they are fixed. 2/n