Darwin's 4 Postulates
Variation, Inheritance, Differential Survival & Population
Charles Darwin: One of the Best
His 4 Principles of Natural Selection
Differences are also inheritable (variation). Could be passed down from generation to generation. Although some traits are constant from each generation, they could vary.
High Rate of Population Growth (Survival of the Fittest)
In order to reproduce, humans must be able to be fit, to survive (Differential Survival). Qualities that help you survive may include: being smarter (brains), being physically fit for your environment, being ready, etc.
Darwin argued that population growth depended on this, on our ability to adapt to a given environment, to our community, and being able to act upon.
The idea that there are differences within a same family. Traits such as inheriting diseases, personality, physical traits (hair color, eye color, ears, nose, etc.), arm length, etc., are all different within each individual.
Differences: They exist naturally within our environment, they are also inheritable. They can be passed down from generation to generation. Darwin was one of the first scientists to actually believe that differences were natural, and people didn't necessarily choose to be certain ways.
Differential Survival (Selective Pressure)
The idea that population can exceed resources. The idea of selective pressure comes in here, those that have what it takes to get to the resources, will survive.
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Bradford, S. (2014, February 3). Natural Selection. Postulates. Retrieved April 7, 2016.
Freeman, D. (2012, November 26). Darwin's Theories. Retrieved April 7, 2016.
Hilton, T.Y (2015, November 20). Darwin: How He Came To Be. Retrieved April 6, 2016.
Johnson, C. (2006, August 3). Darwin's 4 Postulates. Retrieved April 7, 2016.