The bottleneck effect may be a lingering threat ... As Gautschi et al. explain, genetic drift, arguably the most powerful evolutionary force at work in small populations, results from the random ...

Random genetic drift has certainly played a big role in human evolution. Human populations were tiny until around 10,000 years ago, and went through a major bottleneck around 2 million years ago.

Population bottlenecks imply a reduction in effective population size, the increase of sample variance across generations, that is, random genetic drift. As population size drops the stochastic change ...

The accretion model suggests their features developed gradually due to population isolation and genetic drift, driven by ... that they experienced multiple bottlenecks—sharp reductions in ...

An ancestral human species faced a startling population bottleneck and teetered on the brink of extinction around 800,000 years ago, according to new research.

The relative role of drift is commonly overlooked or ignored in speciation,” Black said. He noted that factors like small populations, geographic isolation and the harsh desert ecosystem that produced ...

It exists at the unlikely intersection of random chance and deliberate community planning: The result of generations of intermarriage, genetic drift and the biological bottleneck those factors ...