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Charles Darwin's Theories Of Natural Selection

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Charles Darwin, associated with Cambridge University, revolutionized science with his theories of evolution. His ideas birthed new ways of understanding how species came to be. According to Darwin, the key driving force behind evolution is natural selection, which occurs under environmental pressures leading to speciation. Natural selection allows a population to adapt to changes in environmental conditions. Natural selection also explains how one species may evolve into another through the process of speciation. This is done when the four aspects of natural selection, survival of the fittest, reproduction, genetic variation, and over population, are affected by environmental changes. species produce more offspring that can survive; populations …show more content…

Predation, competition for food and water, competition for space, weather, natural disasters, and disease are all examples of environmental pressures that could bring about the natural selection of traits.
Reproduction is one of the aspects of natural selection. It is the process by which genes and characteristics are passed down from one generation to the next generation. In this way, characteristics are inherited from both parents by the offspring. During the prophase 1 of reproduction, chromosome composition is altered when in the stages of crossing over. Sperm fertilises eggs randomly so the results of reproduction are up to random chance. Sexual reproduction is also the cause of genetic variation, which will be thoroughly explained in a latter paragraph. Accept independent assortment during meiosis from AHL.
Genetic Variation exists between members of one species, which means that some individuals are better suited for survival than others. Individuals that are better suited to changes in the environment survive and pass on their genes for surviving. The sources of variation are: Mutations allows for the mergence of new alleles. Meiosis enables the production of a variety of gametes with random chromosome composition. Sexual reproduction has to do with fertilisation and male

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1. Explain why evolution often selects traits that promote genetic diversity. Evolution often selects traits that promote genetic diversity because genetic diversity boosts the chances that at least some members of the population will have a combination of traits that will allow them to survive and reproduce in a changing environment. Organisms that rely on asexual reproduction have virtually identical offspring, and they are successful in a stable environment; however, conditions rarely remain constant on Earth.

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Variation is a difference of characteristics such as structure, form, function, colour and size when compared to others of the same species within a specific environment. Variation can occur through mutation, the recombination between chromosomes and migration, of which usually happens due to environmental or genetic factors. Variation permits the survival of species in a changing environment and ensures protection from exposure to diseases or environmental disasters. Those who possess variation in species ensures that when their environment changes the individuals will have the variation that will allow them to survive while those who do not possess the variation will die out. This is natural selection and goes hand in hand alongside variation.

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This process is when there's an intentional reproduction of individuals with favorable

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Some examples of this hinted in the article are selection, genes, and environmental factors. Selection is the inheritance of survival, genes create variation, and geographic barriers is explained in the

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In 1859, Charls Darwin set out his theory of evolution by natural selection as an explanation for adaptation and speciation. Charles Darwin theory of natural selection is one of the corner stones of morden biology. The concept, published by Darwin and Alfred Russel Wallace in a joint presentation of papers in 1858, was elaborated in Darwins influencial 1859 book on the origins of species. Darwins ideas, along with Adam Smith and Karl Max had a profound influence on 19th century thought. The influence of Darwins theory has spread from evolutionary biology to other disciplines, including evolutionary computation, quantum Darwinism, evolutionary

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Reproduction is the way in which a species produces new individuals, passing down their genetic code to subsequent generations. Reproduction is vital in maintaining a viable population number and allowing evolution to take place. Evolution occurs through sexual reproduction. Animals, for the most part, reproduce sexually, whereas plants reproduce through either sexual or asexual means. Asexual reproduction needs only one organism, while sexual reproduction requires two organisms.

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