Darwin's Theory Of Human Adaptation

But on his theory of adapt and change Sean. B.Caroll commented negatively saying Darwin did not know how the mechanisms of the process worked and he also stated that Charles had no idea of the physical forces that will actually be the reason why certain species appear differently. Darwin’s main findings was on the Galapagos island where he discovered the Galapagos birds and tortoises. According to Sean, Darwin described the birds as hideous looking creatures with a dirty black colour. The narrator described the shells of the tortoises in the way Darwin did. Their shells differed depending on which island they lived, some of their shells was dome-shaped and the others was more arching you can compare it to a saddle. There was also difference …show more content…
There is a lot of genetic variation in humans the reason for this is because of four processes of evolution namely mutations, gene flow, gene drift and natural selection. Changes happening without a certain method or at random in a genetic code can be defined as mutations this brings change in the ratio of a specific form in a gene allele to the total numbers of forms in a specific population. Mutations often develop into evolutionary change if they can be found in a person’s sex cells because this enables the change to take place generation after generation. Genetic variations can best be described through mutation therefore mutation is a very important process in human variation. Natural selection can determine the new mutations that will enter a population. The evolutionary process of natural selection enhances the ability to reproduce. Genetic drift is used to explain all the differences in genetically isolated populations. Whereas gene flow can be defined as new genes being introduced to the gene pools of a population through the process of interbreeding. (Scupin and DeCorse, 2012:121). The physical environment has an important role in human variation because it limits growth and the process of developing. According to Scupin and DeCorse (2012,122), “Studies have demonstrated that humans are highly sensitive to changes in their physical environment.” This can be of the fact that for example twins that are identical which were separated at birth and grew up in completely different physical environments in other words in different parts of the world will have physical variation because of their different environments. The third and last cause of human variation is