Theories on Evolution of Species

1068 Words Feb 20th, 2018 4 Pages
It “is the process by which modern organisms have descended from ancient ancestors” [1]. Many great scientists have developed theories to answer the question, “Where did life, and human beings, come from?” Two major theories of evolution that still exist, and valid today are Charles Darwin’s theory, and Lamarck’s theory. These two theories have many differences, but attempt to explain evolution.
Charles Robert Darwin, was a naturalist, who proposed one of the most renowned theories of evolution; the theory of “Natural Selection”. Darwin published his work of evolution through his book, The Origin of Species and describes the process of evolution as the “survival of the fittest”. There are four processes to Natural Selection - Variation, Inheritance, Time and Selection. Variation is individuals’ genetic makeup can vary within a population. Variation can occur three ways; sex (the independent assortment of and recombination of genes through meiosis and other processes), gene flow (“movement of genes from one population to another”)[2] and random mutation. Inheritance is the inheritance of genetic traits from parent to offspring. Time is the timeframe where evolutionary changes, such as speciation, can happen. Selection is “survival of the fittest”, where the favourable genes dominate the population. The peppered moth is an animal, which follows Darwin’s theory. The start of the Industrial Revolution caused selection pressure on the light coloured peppered…
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