How Does Natural Selection Work?

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Natural selection is often referred to as the survival of the fittest, and it comes down to differential survival, the fact that survival is not all random and the inheritance of some variations. Discover why those who are best suited to their environment reproduce more with help from a science teacher and field biologist in this free video on biology.

Part of the Video Series: Chemistry & Biology
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Video Transcript

Hi, I'm Brian with Today we're going to discuss natural selection and how it works. Natural selection is often coined survival of the fittest. And essentially it comes down to three major parts. First of all there's differential survival. Some organisms do better than others and so understanding that there are more individuals born than survive is essential. That's part one. Part two is that survival is not all random. There are certain traits and variations that make one organism better suited to their environment than another member of their same species. Third, some of the variation that we see is inherited. So what that means, is it's passed on from parent to offspring. As a result, those who are better suited to their environment reproduce more, they produce more offspring and their offspring in turn pass on those traits that make them better suited to their environment. It's important to remember that in natural selection, the actual agent of selection, so the agent that's making some survive better than others, and really extenuating certain traits, is the environment itself. This has been a brief discussion of how natural selection works.


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