Sentence examples for dramatic bottlenecks from inspiring English sources

Now, evolutionary geneticists have shown that our ancestors lost much of their genetic diversity in two dramatic bottlenecks that sharply squeezed down the population of modern humans as they moved out of Africa between 60,000 and 50,000 years ago.

This process could allow a lineage to recover from dramatic bottlenecks (Vilà et al. 2005).

But new genetic studies of ancient DNA from Neandertals have found that they and the last ancestor they shared with humans, about 600,000 years ago, also lacked much genetic variation, which would require at least three dramatic bottlenecks--an improbable scenario.

With an increased demand for such proteins, production "will soon face a dramatic bottleneck," he says.

This directed pathway is accompanied by a dramatic bottleneck.

recently colonised from field without dramatic bottleneck [ 10]; centromeric X-chromosome loci; average N across loci; single pool of DNA: corrected for elevated Type II error rate.

In this study, we infer that a dramatic bottleneck in the last common microsporidian ancestor (LCMA) left a small conserved core of genes that was subsequently embellished by gene family expansion driven by gene acquisition in different lineages.

Under a predicted scenario based on previous coalescent-based estimates [ 37], in which a dramatic bottleneck down to 10 individuals was followed by exponential growth rate of 10%%, we observed a reduction from 35 initial alleles on the mainland to 4.06 (±0.034) alleles after island colonization.

Based on mtDNA variability of the species studied in this work, it seems very likely that benthic species underwent a dramatic population bottleneck associated with the last glacial advance.

The relatively short duration but dramatic severity of the bottleneck also explains the concordance between estimated census population size and our estimates of Ne, which often differ by up to a factor of ten in wildlife populations [ 31].

In line with indications of a recent population expansion [ 17], this suggests a stronger bottleneck and a more dramatic population growth from the bottlenecked population in the pied flycatcher (ie. smaller refugial populations but significant recent population growth), during re-colonization of Northern Europe subsequent to the retrieval of the ice cover from the latest Pleistocene glaciations.