Tag Archives: natural selection

This new review explains why soft sweeps are the bane — and the baseline — of ecological genetics

If you’ve done ecological genetics research in the last decade, you’ve almost certainly cited a series of papers by Pleuni Pennings and Joachim Hermisson, which broke down the problem of soft selective sweeps. Pennings and Hermisson have revisited soft sweeps … Continue reading

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Shared patterns of genomic diversity across populations of distantly related taxa

Genomic diversity is shaped by the complex interplay between the effects of genetic drift and natural selection among populations. Several of these effects, especially those of linked selection at neutral sites, adaptive introgression, and barriers to migration (often called “genomic … Continue reading

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Music to an amniote’s ears, an “accordion” model of genome size evolution

How did we get where we are? Genetically speaking, that is. A few posts ago, that whole genotype-phenotype question was discussed, how do genomes make plants and animals (and don’t forget the microbes!) look and act how they do. Another … Continue reading

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Divergence and Linked Background Selection

We have widely discussed the reduction in neutral diversity due to demography and linked selection effects (e.g. selective sweeps and hitchhiking, or background selection) in several previous posts (e.g see here, here, and here). However, how linked selection affects neutral divergence … Continue reading

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Ice-Age Euro-trips

Recent works that attempt to get at human migrations inside Europe paint a complex portrait of migratory events, admixture with archaic hominids, and adaptive evolution to new geographies, and a changing global climate. Analyzing whole genomes of 51 ancient humans … Continue reading

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What does the island fox say?

Small populations are characterized by large drift and reduced efficacy of selection effects, which result in fixation of both advantageous and deleterious alleles, accumulation of homozygosity, and often reduction in population fitness. What with plummeting mammal populations across biota, understanding … Continue reading

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Sweeps and Demographic Inference

Population genetics presents us with numerous conundrums – several of which have to do with how the same genomic disposition can be “reached” over evolutionary time with multiple alternate demographic or selective processes. I have discussed several of these issues … Continue reading

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