Darwin's Postulates

Eugenia Martinez

First Postulate

The organisms that survive the longest and produce the most organism are selected naturally by the environment; Thus, if an organism carries certain traits that allows a species to survive and reproduce more than the rest, it shows a potential for a species to increase in number.

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Prior to the Industrial Revolution, the Light Moth was more prevalent in England because they were able to camouflage in the trees. But with pollution, trees became dark, and thus, the Dark Moth population grew exponentially, while the Light population decreased significantly.

Second Postulate

Each organism carries different traits, of which many are heritable. The genetic patterns of organisms change in order to adapt to the environment a species is found. The offspring produced by a species carries heritable genes that vary due to mutation and sexual reproduction.
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An organism’s skin, hair, and eye color are heritable genes. The color of these traits originally changed depending on the climate where an individual lived: Europeans, in a colder environment, have light eye, hair, and skin color. Many individuals now have these traits due to sexual reproduction, regardless of their environment.

Third Postulate

Through generations, many more offspring are produced that can live from the environment. Thus species compete for limited resources, which helps regulate the increasing population caused by a more biologically fit species.
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Trees that are close together are in constant competition for resources such as: soil nutrients, water, and sunlight.

Fourth postulate

Those species that are more biologically fit, produce more offspring that are better able to survive and reproduce in the environment. In fact, a species biological fitness is measured by comparing the population numbers of that species to the others living in the same ecosystem.
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Polar bears are more likely to produce fit offspring in the Arctic than are the Chimpanzee, which belong in the tropical rainforest biome, since that species is not adapted to a certain environment.


*Indentations were not possible in Smore.

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Phillip, M. (1997). “Evolutionary Genetics”. Population and Evolutionary Genetics. North Dakota State University. Accessed on 2016, April 4. Retrieved from https://www.ndsu.edu/pubweb/~mcclean/plsc431/popgen/popgen4.htm

McGinley, Mark. (2008, January 17). “Intraspecific Competition”. The Encyclopedia of Earth. Accessed on 2016, April 4. Retrieved from http://www.eoearth.org/view/article/153875/