Mathematical modeling supports a scenario where cell-cell adhesion gradually evolves through natural selection, leading to the emergence of cohesive aggregates in microbial populations.
Cells of the xanthophore lineage form projections that allow them to communicate with other pigment cells during adult pigment pattern formation in zebrafish, but not in the closely-related pearl danio.
Alison F Feder, Soo-Yon Rhee ... Pleuni S Pennings
The transition from bad to good treatments for HIV was accompanied by a shift from soft sweeps of many drug resistance mutations spreading simultaneously to harder sweeps of one drug resistant genotype at a time.
Transcriptional regulation evolves at indistinguishable rates in mammals, birds and insect lineages despite large differences in underlying rates of sequence evolution.
Achim H Schwermann, Tomy dos Santos Rolo ... Thomas van de Kamp
X-ray imaging reveals well-preserved internal characters in mineralized arthropods from the Paleogene, urging the reexamination of previously neglected fossil collections.
Andrew M Hein, Sara Brin Rosenthal ... Iain D Couzin
A computational model shows that natural selection can cause populations to evolve a distinctive population-level phenotype: the ability to transition between collective states in response to the environment.
Jason W Olejarz, Benjamin Allen ... Martin A Nowak
A mathematical model predicts the precise conditions for natural selection to favor the evolution of non-reproductive workers in insect colonies with haplodiploid genetics.
