By: Daniel Garcia

Natural Selection

Natural selection is the process whereby organisms better adapted to their environment tend to survive and produce more offspring. In other words, it is survival of the fittest, those that adapt to their environment and mutate to cope with the conditions and problems the face on a daily basis will survive.

Overall, The 4 Postulates:

  • Variation - There is a lot of variety within species
  • Inheritance - Offspring looks like their parents, gets traits from them
  • Differential Survival - External conditions can affect survival
  • Extinction - Some traits are not suited for survival and will lead species to die out


All populations of all organisms and individuals vary enormously, no two individual are equal. This genetic variation is due to genetic mutations, random mating or fertilization, and recombination of chromatids of homologous chromosomes in meiosis. It is crucial to natural selection because the frequency of alleles increases or decreases depending on which traits prove useful for survival. The more variety, the more chances a population has at obtaining a favorable allele to keep in the upcoming generations.


Inheritance is the procedure of receiving genetic traits genetically transmitted from parents to offspring. Darwin concluded that more favorable traits were passed on at a higher frequently than useless or detrimental traits. Inheritance is what allows species to evolve and survive.

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Differential Survival

Differential of survival is the theory that food production and populations are directly correlated. Limited quantities of space & resources lead to a struggle for survival results, and as a result those that are the most fit can only survive. The reason behind it is basically that because more organisms are born each generation that can survive, the excess need to be killed by famine or disease. Limited quantities of space and resources lead to struggle for survival so everyone is competing and a result only the most fit can survive.


This postulate goes along with the cycle of life and natural selection. Over time, species become extinct for many reasons. Some species die out because they no longer have the resources they need. Other’s because they are not the fittest species to survive.

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Evansville. (n.d.). Natural Selection. Evensville Education. Retrieved April 5, 2016.


Martin, S. (Apr 2016). Apocalypse Now?. Express News. https://www.express.co.uk/news/science/658686/Apocalypse-now-Experts-say-Earth-in-middle-of-MASS-EXTINCTION-and-here-s-how-to-survive

Pianka, Eric. (2008) Convergent Evolution. Retrieved April 5, 2016, from http://www.zo.utexas.edu/courses/THOC/Convergence.html