Evolution And Evolution Of Evolution Essay

Evolution And Evolution Of Evolution Essay

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All cultures have origin stories or legends to explain their beginning and the beginning of the world. Some culture stories are based in creationism, and others are based in the science of evolution. Evolution is a widely accepted theory of how species change over time. There are four forces of evolution-- mutation, gene flow, genetic drift, and natural selection-- all of which have an effect on all species undergoing adaptation. From microevolution to macroevolution, change is happening to all the time. While it used to be widely believed in European countries that life was fixed and unchanging, the discovery of other animals around the world led to the theory of evolution. Upon discovery, the European explorers realized that all kinds of life are related in one way or another, and populations of organisms often have similarities to other populations in different areas, and the discovery of fossils throughout the world showed that the organisms of the past were different in varying levels from present day organisms, but that many of them seem related. These differences and the physical makeup of present-day organisms are used as evidence of evolution, and show how animals of different species may have common ancestors
Species is defined as the smallest unit in the modern classification system, and can be identified by the ability of two organisms in the same species to reproduce fertile offspring. Think of lions and tigers. A lion can breed with another lion to produce a lion cub, which will one day mate and produce another, and so can tigers. But while lions and tigers seem similar enough, an offspring of one lion and one tiger (a liger) cannot reproduce with another liger, so lions and tigers are not a part of the same species,...


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...may interrupt mating between them. These isolating mechanisms often lead to populations undergoing evolution on their own, without interference from other populations, and may then lead to the formation of a completely different species between them (depending on the population’s respective environments). As the changes within the populations become more prominent, the greater the variations become between generations, and the farther and farther apart the two different populations become genetically. Eventually, the wolves in the previous example are no longer wolves, but two different species. This is the process of speciation. This can occur through cladogenesis, when a species branches out from an ancestral population to give rise to two or more descendent populations, or through anagenesis, a sustained directional shift in a population’s general characteristics.

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