Darwin's Four Postulates

Alvin Methoth

Origin of Species

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1. Variation

Organisms inside a population show individual variations in their appearances and their behaviors. Some traits that can be part of variation include; body size, hair color, facial markings, voice properties, offspring number.

2. Inheritance

Traits that are consistently passed on from generation to generation, from parent to offspring. These traits are heritable and mostly consistent.

3. High Rate of Population Growth

In every generation, more offspring are produced than can survive due to limited resources. This resource scarcity leads to a struggle for existence.


Within an ecosystem those who are best adapted to their environment because of their specific traits are more likely to live on and create new generations. These new generations will have the same traits that will help them survive, stipulating the "Survival of the Fittest" theory.


Academic Works

Buffalo State. (n.d.). Ch 3. Darwinian Natural Selection. Retrieved April 05, 2016, from http://faculty.buffalostate.edu/penaloj/bio405/outline3.html

U Chicago. (n.d.). Darwin’s Principles of Divergence and Natural Selection:. Retrieved April 05, 2016, from Darwin’s Principles of Divergence and Natural Selection:

UC Berkley. (n.d.). Introduction to Ecological Genetics - Darwin's Four Postulates. Retrieved April 05, 2016, from http://ib.berkeley.edu/courses/ib162/Week1.htm


Gawker Media. (2010). Survival of the Fittest [Digital image]. Retrieved from https://i.kinja-img.com/gawker-media/image/upload/s--NdIBlzXC--/c_fill,fl_progressive,g_north,h_358,q_80,w_636/18gk4sf8cqyu5jpg.jpg

Harunyahya. (2009). Finch Variation of Beaks [Digital image]. Retrieved from http://www.harunyahya.com/image/Evrim_Acmazi/finch2.jpg

Spickleregan. (2011). McNeil River Brown Bears [Digital image]. Retrieved from http://www.spickleregan.com/sites/default/files/images/McNeil River brown bears -

fighting - cropped2.png

SyntheticGeo. (n.d.). Synthetic Genetic Composition [Digital image]. Retrieved from http://www.synthetic-bestiary.com/wp-content/uploads/Genetics_wallp_Tw.png

Wikimedia. (1998). Darwin Charles [Digital image]. Retrieved from https://commons.wikimedia.org/wiki/File:NIE_1905_Darwin_Charles.png