A population bottleneck or genetic bottleneck is a sharp reduction in the size of a population due to environmental events such as famines, earthquakes, floods, fires, disease, and droughts; or human activities such as genocide, speciocide, widespread violence or intentional culling.

2022年6月23日 · In some small populations, inbreeding causes once rare genetic diseases to become common, despite their deleterious effects. A new analysis of more than 4,000 ancient and contemporary human genomes shows how common such “founder events” were in our history.

2018年5月31日 · But the Neolithic Y-chromosome bottleneck, as it is known, has been something of a puzzle since its discovery in 2015. This is because it was only observed on the genes on the Y chromosome that get passed down from father to son - which means it only affected men.

2012年10月22日 · Radiolab regular Sam Kean's new book on genetics, The Violinist's Thumb, tells the story of Toba, the supervolcano, to explore how human genes record a "bottleneck" or a drastic narrowing of...

2016年3月18日 · Scientists have mapped these events to geographic choke points around the world, based on decreasing genetic diversity as we migrated. One bottleneck occurred when a small group of humans left...

2009年10月8日 · 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.

2023年8月31日 · Results showed that human ancestors went through a severe population bottleneck with about 1280 breeding individuals between around 930,000 and 813,000 years ago. The bottleneck lasted for about 117,000 years and brought human ancestors close to extinction.

2023年8月31日 · Researchers in China have found evidence suggesting that 930,000 years ago, the ancestors of modern humans suffered a massive population crash. They point to a drastic change to the climate...

2000年1月1日 · We examine how these genetic data constrain the possibility of significant population size bottlenecks (i.e., of sufficiently small size and/or long duration to minimize genetic variation in autosomal and haploid systems) at several different critical times in human history.

2023年8月31日 · Wangjie Hu, of the Chinese Academy of Sciences, and colleagues suggest that between 813,000 and 930,000 years ago the population of ancient humans that would eventually give rise to our own...