Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Our model for shifts between two populations in the intensity of purifying selection on a gene. See text for details. Subindices 1 and 2 refer to population 1 and 2, respectively. S(f) denotes the stochastic transformation and D(f) the deterministic transformation. Dark gray represents the central 50th percentiles of the probability mass, and light gray represents the central 95th percentiles. The arrows in D and E represent the values of f before and after the transformation.
