Natural selection, genetic drift, and gene flow are the mechanisms that cause changes in allele frequencies over time. When one or more of these forces are acting in a population, the population ...

Gradual evolution is back: Darwinian theory of gradual process explained in new research Date: March 2, 2022 Source: University of Reading Summary: Abrupt shifts in the evolution of animals ...

Stroud expected to observe stabilizing selection at work preserving moderate traits. Instead he saw clearer evidence of directional selection: some lizards with unique traits, such as stickier ...

Rebecca J. LeGrice, Gabriela Tezanos-Pinto, Pierre de Villemereuil, Gregory I. Holwell, Christina J. Painting, Directional selection on body size but no apparent survival cost to being large in wild ...

Based on the new study, Schield suspects that while directional selection may have driven the origins of venom, in more recent timescales, there may be an equilibrium shift towards balancing selection ...

For six weeks, we followed immune activity, growth, and two fitness components, survival and fecundity of snails. We found that PO-like activity and growth were under stabilizing selection, while ...