This is also called as modern concept of organic evolution. The concept of Neo-Darwinism is a view of evolutionary theory arising out of a combination of Mendelian genetics, mutation theory by De Vries with Darwinism a group of eminent scientists lie Dobzhansky, De Vries, Weismaa, Fischer, J.B.S Haldane, HJ. Mulles, simpson, Gold Schmidt, Sewall Wright, Huxlay etc., constituted a group called Neo-Darwinism school of thought.
According to Neo-Darwinism, the gene pool in sexually reproducing organisms is the focal point to interpret evolutionary changes brought about by mutation, gene flow, genetic drift, genetic recombination, chromosomal aberrations, natural seloction and isolation.
1. According to Darwinism, rapid rate of reproduction leads to struggle for existence during which useful variations help in the survival of an organism picked up by natural selection The accumulation of such variations from generatjon to generation is responsible for the origin of a new species while according to Neo-Darwinism change in the gene frequency is evolution.
2. According to Darwinism, source of variation was not explained. The somatic and genminal variations were not differentiated and were considered as heritable while Neo-Darwinism differentiates somatic and germinal variations and has understood the principle of inheritance.
3. According to Darwinism, evolutionoperates on an organism while Neo-Darwinism believes that evolution operates on a goe pool.
4. According to Darwinism, natural selection operates through survival of the fittest, while in Neo-Darwinism natural selection operates the differential reproduction and comparative reproductive success.
5. According to Danwinism, the survival of the fittest was explnod but not the arival of the fittest while Neo-Darwinism explains the arrival of the fittest
