The evolution of populations is a very complex process. Although individuals are selected by nature, they are unable to evolve during their lifetimes; Instead only populations are able to evolve once certain heritable variations become more common. In his book The Origin of Species, Charles Darwin presented his theories about evolution and natural selection. Although his theory on evolution became excepted, Darwin was unable to convince people about natural selection. He lacked the genetic information about traits, that Gregor Mendel would later discover. However, when Mendel's work was later rediscovered, it seemed to be at odds with Darwin's theories. Darwin focused on traits that differed in a community, such as fur length or speed for his basis of natural selection. However, Mendel's theories said that these factors were"either-or" traits which meant you were either fast or slow. Early geneticists believed that changes occurred due to wide spread mutations in a population'!
             s phenotype. However, the major cause in evolution is having a gene fixed in the gene pool. Fixing a gene means that all of the members in a population are homozygous for the same trait. Usually, it is more common for the dominant gene to be over represented in the population. Often, over fifty percent of a population is homozygous dominant, the next thirty-five to forty-five percent are heterozygous, and finally the last fifteen to five percent are homozygous recessive. One cause for this could be genetic drift. For example, if ten flowers make up a population, and only five(4-heterozygous and 1 homozygous recessive) reproduce, they produce a second generation of ten flowers. If only two (both heterozygous dominant) reproduce, then the entire third population will be heterozygous dominant, and the gene pool will be fixed. Another way is when a population is isolated. This forces a species to inbreed or become extinct. The inbreed...