The development of living organisms from non-living matter, as in the origin of life on Earth, or in the concept of spontaneous generation which was once held to account for the origin of life but which modern understanding of evolutionary processes has rendered outdated.
In 1908, English mathematician Godfrey H. Hardy and German physician Wilhelm Weinberg independently derived a mathematical model describing what happens to the frequency of alleles in a population over time. Their combined ideas became known as the Hardy-Weinberg theorem. It states that the mixing of alleles at meiosis and their subsequent recombination do not alter [...]
Lamarckism (Theory of Inheritance of Acquired Characters) This theory was proposed by French biologist, Jean Baptiste de Lamark in 1809. It was published in ‘Philosphie Zoologique’ in the year 1809. It is popularly known as “The Inheritance of Acquired Characters in Organisms’. Definition: Lamarckism or theory of inheritance of acquired characters can be defined as [...]
The theory of organic evolution appears most plausible explanation for the occurrence of varied forms of plants and animals on this earth. But an absolute proof in this connection is lacking. The circumstantial proof is the only type of evidence available. The convincing evidences for the occurrence of descent with modification come from: Morphology and [...]
The similarities among living organisms indicate that all of them have evolved from some single common ancestor (This is called monophyletic origin). Through the process of gradual modifications, adaptations and natural selection, over a million and a half different species have evolved from a common ancestral form. This process is called evolution or organic evolution. [...]
