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A population bottleneck (or genetic bottleneck) is an evolutionary event in which a significant percentage of a population or species is killed or otherwise prevented from reproducing. This reduces the genetic diversity of the population, and even if the population bounces back in size, it can often show evidence of the past bottleneck by lacking significant variation for its size. A good example is that of the cheetah, whose current population shows almost negligible variation. Humans are not currently experiencing any genetic bottlenecking because the population is increasing. However, there is evidence suggesting that the human population underwent one or more bottlenecks in the past, since its overall genetic diversity is relatively low for its size.
New since when? The answer may include anything from new palaeontological evidence (eg. fossils and such) to new geophysical findings to the advent of genetics and new findings in the fields of genetics and genomics to the latest findings based on the mathematical modelling of population dynamics and population genetics, and so forth, and so on. Perhaps a more specific question might help.
New since when? The answer may include anything from new palaeontological evidence (eg. fossils and such) to new geophysical findings to the advent of genetics and new findings in the fields of genetics and genomics to the latest findings based on the mathematical modelling of population dynamics and population genetics, and so forth, and so on. Perhaps a more specific question might help.
direct evidence is the observation of evolution as it occurs. We have discovered novel genes conferring an advantage in an environment in which the ancestral population lacked those genes entirely. One example is flavobacterium that evolved nylonase enzymes. Antibiotic resistance is another example.
Evolution is the change in allele frequency over time in a population of organisms. One of the most important things modern genetics can do is observe this fact of nature by modern evolutionary genetic sequencing of many population genomes.
no evidence has been found
a fossil
Well, fossils tell about a once living creature. But in (Greek) stories, the Pegasus and Cyclops obviously did not exist. what is this answer
This is usually only available through some type of fossil, unless the creature is still living and is observed directly.
named by the scientist who found the fossil evidence of said creature
It is known as a fossil.
It really depends on your religious beliefs. There is no physical evidence of any angels existence.
Burning of metals in fireworks is a chemical reaction and is what makes the fireworks glow with different colors.
We have not yet found any evidence of life on Mars, let alone footprints.
Q:Would our sun ever become a Supernova?Q:What are Supernovas?Q:Can we find evidence for the acceleration of icons in SNRs?
Current evidence points to a spider-like insect that lived about 410 million years ago.
they found weird foot prints and took a lot of strange pictures of a tall creature.