Darwin's Postulates

Vilma Guzmán

Who is Darwin?

Charles Darwin was a Biologist and a Scientist who was born in Shrewsbury, England, on February 12, 1809. He was the father of evolutionary biology and was best known for his work as a naturalist and developing the theory of evolution. He traveled for five years around the globe and his investigations led him to formulate his theory of evolution and his views on natural selection. He explains the biological change in four postulates and realized that species changed over the generations. His best work was On the Origin of Species by Means of Natural Selection. He then died on April 19, 1882, in London.

Darwins's Four Postulates

1. Individuals within species are variable

2. Variations are heritable

3. Individuals vary in survival and reproductive success

4. Survival and reproduction are not random.

Postulate #1

Individuals within species are variable

So in the first postulate of Darwin he states that individual organisms have different traits which they posses. For example hair color, height, skin color etc.

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Postulate #2

Variations are heritable

The second postulate of Darwin states that some of the trait differences are heritable and are passed on from a parent to an offspring. So basically the ones who are more fit phenotypes are to be better represented in the next generation.

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Postulate #3

Individuals vary in survival and reproductive success

In every generation, more offspring are produced than can survive. Meaning that the ones who survive are the ones who are best suited in that environment and the ones who are not die.
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Postulate #4

Survival and reproduction are not random.

According to Darwin's line of evidence, postulate number four indicates that the individuals who survive and reproduce the most have the most favorable variation and are naturally selected. It follows that the characteristics of the population will change with each generation until the population becomes different from the original one. This process is known as evolution.


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Smith, D. (2012). Darwin’s Theory of Evolution. Retrieved April 07, 2016. http://www.science4all.org/article/darwins-theory-of-evolution/

Williams, J. (n.d.). Ch1. Adaptation by Natural Selection. Retrieved April 07, 2016. http://www.wwnorton.com/college/anthro/bioanth/ch1/chap1.htm