Essay about Charles Darwin 's Principles Of Evolution

1574 Words Oct 22nd, 2016 7 Pages
Charles Darwin is very well known for his theories on evolution and most importantly his three principles of evolution by natural selection. Darwin’s first principle is that a variation exists within populations. Some examples of variations include body size, bone structure, tooth size, hair thickness, shape of the rib cage and position of the foramen magnum. In Evolution, Dr. Alice Roberts provides examples of early hominins and how their physical makeups were reconstructed by archeologists in order to determine their different variations. Different physical characteristics or variations can either increase or decrease the fitness of an organism. An organism’s fitness in anthropology does not refer to cardiovascular fitness, but rather to an organism’s ability to reproduce and pass on its genes to its offspring. The second principle of evolution is the fact that variation is passed to offspring through heredity. If variation is favorable or if it increases the fitness of an organism than according to natural selection, that variation will become more common in the generations to follow. In contrast, those organisms that experience variation that has a negative impact on their fitness will not survive long enough to reproduce successfully. Therefore, their offspring and heritable traits will not be reoccurring in the future generations. The idea that different physical characteristics among organisms causes them to produce a varying number of offspring is Darwin’s…

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