Evolution Strong selection genome-wide enhances fitness trade-offs across environments and episodes of selection Jill T. Anderson, Cheng-Ruei Lee and Thomas Mitchell-Olds
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Abstract Fitness trade-offs across episodes of selection and environments influence life-history evolution and adaptive population divergence. Here, we evaluate fitness trade-offs at the levels of the whole organism and the quantitative trait locus (QTL) in a multiyear field study of Boechera stricta (Brassicaceae), a genetically tractable mustard native to the Rocky Mountains. Our analytical framework can be applied to other systems to investigate fitness trade-offs. Right: Fecundity components of fitness increase as a function of the percentage of the genome with Montana alleles (MT%) for the 2008 Montana cohort.
Evolution & Development Expression patterns of Wnt genes in the venom claws of centipedes Luke Hayden and Wallace Arthur
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Abstract The venom claws of centipedes, also known as forcipules, represent an evolutionary novelty that must have arisen in the centipede stem species, as they are not found in any other myriapods. The developmental-genetic changes that are involved in the origin of novelties are of considerable interest. It has previously been shown that centipede forcipules have a unique Hox code. However, this is a combinatorial code: no single Hox gene has a forcipule-specific expression. Here, we focus on Wnt genes. Right: Ventral view of anterior region of Strigamia maritima adult, with forcipule and leg labeled to display differing morphologies.
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