Darwin Postulates


Increase in number

Evolution can be seen through time in species, humans and plats. It is sometimes referred to, as species that are not static but can change through time. For example; fruit flies. The population of fruit flies, in the biology class increased in number, over a period of 2 weeks. The population of fruit flies, lived in the same area at the same time and they showed how they would not be static of unchanging but they would rather increase in number.
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Genetic Variation

DNA affects how organisms look and how they behave. Mutations, usually occur randomly, and can be beneficial, neutral or harmful. For example we can work with flies. Most flies are born normal, with their antenna in place, but mutations can occur where the fly is born with a Hox gene and their leg is placed where the antenna is supposed to be. in this case, the mutation controls the look of the fly, and with the favor of natural selection, the fly now has a mutation.

Evolution fact : dogs sometimes seem unable to spot a bright color in a soccer ball because they have only 2 color sensitive retina pigments and humans have actually three.

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One of the most basic resources is food, and most of the time, animals will fight and compete for food. Animals and organisms need to struggle for existence and will always try to survive in the environment. One example could be cheetahs and lions. Both species feed on basically the same prey and live in the same environment. They are negatively impacted by the presence of each other because they will have less food and they will have to fight each other to obtain food. Since they compete, one will displace the other as they fight for the same prey.
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Fitness will vary among phenotypes. There is a relationship between phenotype and fitness, and in this postulate we will look at, "survival of the fittest." Since offsprings are produced, women will survive, while others will die. And those who survive, have the greatest fitness. (genes are a major factor) Organisms that have greater fitness, will more likely reproduce and pass the allele of survival to the next generation, this process, repeats over generations and evolution occurs. For example the crocodile. This animal dates back to the dinosaurs, and they have lived up to day. Unlike the dodo bird that also dates back from long ago, but was extinct.
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Mayr, E. (1991). One long argument: Charles Darwin and the genesis of modern evolutionary thought (Vol. 2). Harvard University Press. Retrieved from, https://books.google.com.mx/books?hl=en&lr=&id=zVdInvOSMmwC&oi=fnd&pg=PA1&dq=darwins+postulates&ots=B78lpGfHZ6&sig=016M3qV07GWbKjenA7eqT-sbsik#v=onepage&q=darwins%20postulates&f=false

Vincent, T. L., & Brown, J. S. (2005). Evolutionary game theory, natural selection, and Darwinian dynamics. Cambridge University Press. Retrieved from, https://books.google.com.mx/books?hl=en&lr=&id=6O40X9o8ELwC&oi=fnd&pg=PR11&dq=darwins+postulates&ots=0i2RARlJYF&sig=PlFHEwKG5KNDks0WtiTJfT9EESY#v=onepage&q=darwins%20postulates&f=false

Rauch, A., Wieczorek, D., Graf, E., Wieland, T., Endele, S., Schwarzmayr, T., ... & Dufke, A. (2012). Range of genetic mutations associated with severe non-syndromic sporadic intellectual disability: an exome sequencing study.The Lancet, 380(9854), 1674-1682. Retrieved from, http://www.sciencedirect.com/science/article/pii/S0140673612614809

Shavit, A. (2004). Survival of the Fittest. Ha’aretz, 9. Retrieved from, http://people.na.infn.it/~clarizia/palestina/giusti/Morris_intervista_9-1-04.pdf