Why Are Living Organism so Diverse ?

1541 WordsNov 11, 20067 Pages
Why are Living Organism so Diverse ? Regardless of world's life diversity, we all, from the ant to the whale and us humans have DNA linkage, which gives us the evidence for one common ancestor. The question that comes up now is how from this very primitive common ancestor did we all end up so diverse. Biologist have dedicated they life to answer this question, Through this essay I shall show how through different aspects life has become so diverse. Timescale Life as not evolve suddenly from its primitive form to complex organism like it is observed today, changes have operated over large timescales. For example Homo sapiens is the result of 4 million years of evolution from the Australopithecus afarensis. Homo sapiens as seen on…show more content…
A good up to date example of natural selection is the virus HIV (human immunodeficiency virus). The virus has rapid rates of reproduction and therefore a lot of variation exists among a large number of the individuals in the HIV population. While using drugs to treat this virus, researchers actually use natural selection among the HIV population. As few virus will always be resistant to the drug it is treated with, they will than pass on the genes that are resistant to this drug to the next generation of HIV, than by the mean of fast reproduction the HIV population becomes resistant to that drug. Artificial selection today has been widely used to create new species, in agriculture for example (picture 1.4) the wild mustard plant as been used to produce broccoli, cauliflower, cabbage, Brussels sprouts, kale and kohlrabi by selecting desired features in each part of the plant breeders have than
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