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Science in Seconds - Neutral Selection

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Science in Seconds Know Everything RUMOURS - Neutral Selection Rheanna Sand: The concept of natural selection is almost synonymous with evolution. We've all learned that survival of the fittest individuals increases the presence of their genes in the next generation. This leads to more advantageous characteristics in the population over time. Species are not perfect, especially ours. So there must be a reason of the bad gene spread in our population, besides stupidity. Part of the answer is something called "neutral selection." As the name suggests, neutral selection does not pick sides. It favors adaptive and harmful genes equally. It all boils down to a simple biochemical limitation of DNA. During the production of eggs and sperm, DNA gets shuffled around and copied, and some mistakes are made in the process. When this happens, some mutations are more likely to occur than others. In particular, base pairs are changed more often from an adenine-thiamine or AT pair to a cytosine-guanine or CG pair, and not the other way around. This biochemical bias leads to certain mutations becoming more frequent in a population, regardless of how they affect reproductive success. And according to large-scale analysis of human DNA compared to close primate relatives, many human characteristics might have evolved not because they're beneficial, but because they were chemically easier. Survival of the... laziest? It sounds about right. Courtesy of Science in Seconds – All rights reserved Only for educational/non-profit purposes. (Translators are invited to put their name here)

Video Details

Duration: 1 minute and 45 seconds
Year: 2010
Country: United States
Language: English
License: All rights reserved
Producer: Science in Seconds
Director: Science in Seconds
Views: 36
Posted by: tradottiinitaliano on Sep 10, 2011

On the survival of the laziest.

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