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Charles Darwin's Theory Of Natural Selection

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Natural selection is defined as the process in which organisms evolve for enhanced adaptations to survive within their environment, a concept of evolution. Natural selection does not attempt to answer how life begins, but how life’s physical characteristics changes through time. The key characteristic, pointed out by Jean-Baptiste Lamarck and Charles Darwin, natural selection essentially defines itself by is genetic variation, a key mechanism to evolution. The theory of natural selection is famously known by naturalist Charles Darwin, supported by the forgotten scientist Lamarck, who introduces five main points to natural selection. The five main points are overproduction, competition, adaptation, reproduction and variation. Charles Darwin main point to natural selection is that only the fittest will survive, and if the fittest organisms meet the five points, they have reached their climax. …show more content…

Within the group of offspring, those offspring must have genetic variations to enhance adaptations; and within their genetic variation, the offspring must inherit some characteristics from their parents. Organisms with the best possible combination of genetic material have the more probably chance to winning competition for resources and survival, as well as passing down DNA. This is how species evolved. As their environment change, so do they. If the species doesn’t evolve, they have a higher chance of being prey to predators. Natural selection affects individuals by forcing the species to interact and reproduce. If the individuals fails to meet one of the points Darwin outlined, then their genetic code have died within that line, however that doesn’t mean that its population has deteriorated; it just means that the unique genetic code acquired by the failed individuals are no longer

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Natural selection, the process in which individuals that have certain inherited

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Any genetic variation possessed can be an advantage or disadvantage depending on the environment. For example, an organism that is red is less likely to survive in a green grassy

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A person centred care approach ‘considers the needs of a person as a whole, this including their physical, social and psychological needs’. This means that a person is seen as an individual and the care that they will receive is ‘not to or for them but in partnership with them’. (The Open University, 2014, p. 90). Person centred care, allows the individual and their families to be involved in the care that they are receiving. Person centred care services should ‘offer flexibility and should be promoting independence’ and allowing that person to have an input in any decisions being made.

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In this chapter, Darwin is very concerned about the topic of natural selection. He makes the point that just like in artificial selection where breeders might choose a particular feature in organisms and preserve this feature by breeding organisms with this trait more than organisms lacking the trait. Darwin mentions that nature acts in the same way, choosing some variations which are beneficial to the organisms in a specific environment and these variations are the ones which are said to be advantageous. If organisms do not naturally have variations which make them adapt easier to their environment they’re more likely to die out and be extinct. Darwin also discusses the concept of sexual selection which plays a huge role in species evolution.

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This process allows the strong and more adaptable animals to survive and carry on their genes to their children. There are many examples of natural selection all over the world; however, the giraffe is a one of the best examples of this process. Giraffes originally had much smaller necks then they do today. This was because the earlier giraffes had the

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When two populations no longer interbreed this causes evolution of two separate species. This may be caused by behavioral isolation, geographic isolation, or temporal isolation. If they become so different they will no longer be able to interbreed because each organism will have a different number of chromosomes, so the genetic information from the male can’t find a proper match with the genetic information from the female. When this occurs the population of that organism can decrease. Why would organisms change their DNA?

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Only the offspring with certain traits that were suitable with the environment survived. This led him to believe that species evolve from a common ancestor because he saw that many organisms had similar traits and that they eventually accommodate to their surrounding

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This process is known as natural selection, which explains how Charles Darwin’s theory of evolution can occur. Natural selection is an important component of evolution. It occurs when some members of a population are better fit for survival and proliferation than others in that population. The environment in which organisms live plays a large part in natural selection as well.

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But Darwin also explains that there are some traits that do not change that much for example the fact that most vertebrates have two eyes. The second component of the theory of natural selection is Inheritance. Darwin explains that even though some traits in living organisms

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The first postulate of natural selection is, “the ability of a population to expand is infinite, but the ability of any environment to support populations is always finite” (Boyd and Silk 2015:6). In other words, a population of species can thrive only if their resources are plentiful. When those resources

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Natural Selection is the long gradual process in which Biological traits either become more or less common in a population as a function of the effect of inherited traits on the differential reproductive success of organisms interacting with their environment. In Darwin’s work The Origin of Species he also mentioned evidence for the Theory of Evolution from his voyage around the world on The H.M.S. Beagle. The Origin of Species is probably the most influential work on evolutionary biology. The Origin of Species will help prove my thesis because it introduces the ideas that we base on evolutionary biology today.

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Charles Darwin became famous for his theory of natural selection. This theory suggests that a change in heritability traits takes place in a population over time. This is due to random mutations that occur in the genome of an individual organism, and offspring can inherit these mutations. This was defined as the key to evolution, this is because random mutations arise in the genome of an individual. Until the 19th century, the prevailing view in western societies was that differences between individuals of species were uninteresting departures from their platonic ideals of created kinds.

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Since now we know lots about artificial selection, let 's hear a bit about natural selection also known better as, the process whereby organisms better adapted to their environment tend to survive and

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One mechanism is genetic variation. Genetic variation can occur if new alleles get produced by mutations or if alleles sort into different combinations during meiosis than what was genetically written. The second mechanism of evolution is genetic drift. In this mechanism, alleles will either disappear as an effect to a natural event or alleles will get isolated in one sub-set of a population and will genetically vary from the original population. The next mechanism is gene flow, which is when alleles from one population migrate to another population and changes the genetic variation of both populations.

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He says that, “We can not select genes that are not in the gene pool of the species.” For example there is no gene for wings in the gene pool of a pig. Would you expect to see a new born pig with a growing set of wings? No, because it is not in it’s DNA. This is what natural selection is proposing.

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