Darwins Postulates Smore
Oscar Ruiz
How it all started
Darwin made some experiments with artificial selection, and with further observation he believed that the same type of selection he was doing in his experiment could happen naturally. Darwin figured out that four things needed to be correct so his research about natural selection would be valid, and thats how its know as Darwins Four Postulates.
Four Postulates
Variation among individuals within species
The first postulate is fairly simple to understand, it is simply saying that their has to be variation of phenotypes or traits. Imagine it this way, if their was absolutely no variation in traits, their would be nothing to select from. So natural selection will never occur and neither will evolution.
In every generation more offspring is produced that can survive
Think of it as survival of the fittest, the ones that are best fitted or the strongest ones have more chance of surviving. It goes back to Darwins idea saying not all offspring can survive, only the ones with the better or more adaptive traits.
Survival and Reproduction of Individuals Is Not Random
The third postulate is strongly correlated with the second one, since it goes back to the idea that the strongest are the ones that survive. It is not random since the people with the strongest traits are the ones that live enough to reproduce.
Some Variation is Heritable
If a unique variation occurs in a individual or a animal, it is tested that the parents had an offspring with that same variation. It also applies to natural selection, if the parent had a specific variation that helped him survive, it will also be reflected in the next generation.
Bibliography
John Pojeta, Jr. and Dale A. Springer. (2016).Agiweb.org. 8 April 2016, http://www.agiweb.org/news/evolution/darwinstheory.html
Majo Lina | Quizlet. (2016). Quizlet.com. 8 April 2016,
https://quizlet.com/5655415/darwins-observations-inferences-flash-cards/
Futuya D.J . (2016).Globalchange.umich.edu. 8 April 2016, http://www.globalchange.umich.edu/globalchange1/current/lectures/selection/selection.html
Shomus Buffon, Darwin's postulates (theory of evolution). (2016). YouTube. 8 April 2016, https://www.youtube.com/watch?v=o4HLfcK4lIY