The Theory Of Evolution Of A Population Over A Number Of Continuous And Successive Generations

1539 Words Nov 11th, 2015 7 Pages
Evolution is the change in genetic composition of a population over a number of continuous and successive generations, which may have resulted from natural selection, inbreeding, hybridization, or mutation. (Biology Online, 2008). This change occurs when there is genetic variation, a variation of genomes between members of species, or groups of species thriving in different areas as a result of genetic mutation. (Biology Online, 2009).
The two major mechanisms considered to be the driving force of evolution can be depicted in Figure 1 and 2. The first is natural selection, which is the theory of evolution proposed by Charles Darwin. This is the principle by which each slight variation, if useful, is preserved and passed on to the next generation. (Darling, n.d). The second mechanism involves genetic drift, the random change in allele frequencies. (Causes of Association, n.d).
Throughout history, humans have interfered with the evolution of other organisms. The interference of humans has had both a positive and negative impact on the biodiversity of other species. As the issues of current droughts and future potential global widespread droughts are raised, genetic engineers have focused on designing drought-resistant plants which are able to withstand dwindling water supplies. (Wilcox, 2015).
Past
In the past, before the first discovery of tools and fire, humans “lived in large herds and were prolific; polygamy was in vogue, and at the courting season…
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