Most of us think about evolution in some prehistoric sense. After all, we were first exposed to the theory of evolution in elementary school studying about dinosaurs. But evolution has not stood still; it has been an on-going process. There are many contributing factors to micro and macroevolution. Microevolution therefore refers to changes in DNA within a population for adaptation. Scientists have uncovered a gene BMP4, which shapes the beaks in Galapagos Finches. According to Weiner the finches represent the best and most detailed demonstration of natural selection. Therefore, whenever the food quality changes as a result of a drought or raining season. During the next couple of years, researchers could see a dramatic change in the beak sizes in various populations. Natural selection can drive changes of their beak sizes in response to selective pressure. As a result, the finches with more BMP4 revealed larger beak sizes. The evidence is all around us. The Galapagos Finches are a good example of microevolution; they provide small changes within a species. But I failed to see any facts that support for macroevolution. It is the process of one species changing into a different species over a long period of time. By producing a dog into a different species that would be an example of macroevolution. …show more content…
Because of excessive hunting at Ram Mountain in Alberta, Canada the Bighorn Sheep has almost reached extinction. Weiner continues by discussing some reasons for the genetic variation of the Bighorn Ram changes, and when they reproduce they create a smaller ram. As in the case of the Ram horns they have gotten smaller. Up until now, I have never noticed these differences. So every species known to mankind is constantly under selective