Natural selection

A brief treatment of natural selection follows. For full treatment, see evolution:

Natural selection

What is natural selection, and how is it central to the theory of evolution? Natural selection is how species evolve by adapting to their environment. Natural selection explains design in nature.

Natural selection

Charles Darwin studied beak variation of finches on the Galapagos Islands as evidence of natural selection. Molecules to Man, Natural selection is the process by which species adapt to their environment.

Natural selection leads to evolutionary change when individuals with certain characteristics have a greater Natural selection or reproductive rate than other individuals in a population and pass on these inheritable genetic characteristics to their offspring.

Simply put, natural selection is a consistent difference in survival and reproduction between different genotypes, or even different genes, in what we could call reproductive success.

It is the one process that is responsible for the evolution of adaptations of organisms to their environment. Evidence to support evolution and natural selection, of course, has accumulated over time, and now science accepts that evolution is a fact and that natural selection explains very well how adaptive evolution takes place.

Is natural selection the only mechanism of evolution? Evolution has several mechanisms. Genetic drift involves random changes. There cannot be evolution without genetic variation in the first place. So there must be mutation and often recombination to generate the different genotypes or the different versions of the genes, known as alleles, which then may or may not make a difference in the ability of an organism to survive and reproduce.

But once you have genetic variation, there are basically two major possibilities: Natural selection is more consistent, adaptive change.

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First, there is simply no difference between the different genotypes or different genes in their impact on survival or reproduction, and in that case, you can have random changes of one versus the other type in a population or a species until eventually one replaces the other.

That is an evolutionary change. It happens entirely by chance, by random fluctuations. That is what we call the process of genetic drift.

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Genetic drift is very different from possibility number two, natural selection, which is a much more consistent, predictable, dependable change in the proportion of one gene vs. Simply because there is some consistent superiority, shall we way, of one genotype vs. Does natural selection lead to new species, and if so, how?

Natural selection plays a role in the origin of new species.

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It sometimes does but not always.A common criticism of natural selection is "how can it produce novel complex useful structures by pure random chance?" Darwin's answer to this "difficulty", (which he actually raised himself), was that selection is NOT a random process, and furthermore, it is cumulative, which he ably explained.

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The fastest teams should be able to clear the course in . Natural selection is the process by which individuals with characteristics that are advantageous for reproduction in a specific environment leave more offspring in the next generation, thereby increasing the proportion of their genes in the population gene pool over time.

Paul Andersen details examples of natural selection in the world. He starts by explaining how changes in global temperatures are causing plants to adapt. a natural process that results in the survival and reproductive success of individuals or groups best adjusted to their environment and that leads to the perpetuation of genetic qualities best suited to that particular environment.

biology, where Darwin’s advocacy of natural selection won the day because it provided a mechanical means for the march of evolution. The struggle for life (Spencer’s phrase of , adopted by Darwin in the subtitle of his book) obviously had the requisite “toughness” to convince and, .

Natural selection
Natural Selection