They have different approaches because of the development of scientific theories at different times. Given below are some difference between Darwinism and Neo Darwinism. Neo Darwinism. Darwin explained and enhanced the theory of natural selection which came to be known as Darwinism. This explanation was mostly based upon observable facts by the naked eye. Neo Darwinism is a form of Darwinism which developed after many exemplary findings of genetic research.
It explained the theory of natural selection by incorporating genetic findings. This is an original theory built on the extensive research of observable species of birds, butterflies and other living organisms carried by Darwin himself.
This theory is adapted from the theory of natural selection by Darwin, where it replaces the premier importance of observable characteristics to genetic characteristics. The major cause of changes in species is described by the accumulation of the inheritable phenotypic changes over generations of an organism.
The major cause of variation in species according to Neo Darwinism is the variation that takes place in the genes of particular organism i. The cause behind the phenotypic variation has not been explained by Darwinism. Neo Darwinism theory explains the cause of variation of the genes as mutations in the genes, genetic recombination, natural selection and reproductive isolation.
Darwinism does not describe the reason for variation while Neo Darwinism describes the reason for variation as mutation, genetic recombination, natural selection, and reproductive isolation.
In Darwinism, variations occur in individuals while in Neo Darwinism, variations occur in the gene pool. Hence, this is also an important difference between Darwinism and Neo Darwinism. In Darwinism, natural selection is the survival of the fittest and the removal of the unfitted organisms during a course of time while Neo Darwinism, natural selection is the differential amplification of the fittest genes and genotypes.
Also, one other difference between Darwinism and Neo Darwinism is that Darwinism does not believe isolation as a major component of evolution while Neo Darwinism believes isolation as a major component of evolution. Darwinism is the original concept developed by Darwin describing the origin of new speciation.
Accumulation of the fittest phenotypic variations within individuals is the main driving force of speciation according to Darwin. Therefore, natural selection is the survival of the fittest in the environment. On the other hand, Neo Darwinism is a modified theory of Darwinism, describing the origin of species according to a genetic basis. It considers only inheritable genetic variation mutations for evolution.
It explains the reason for variations. The major factors responsible for organic evolution include mutation, genetic recombination, natural selection and reproductive isolation. In Neo-Darwinism, the basic unit of evolution is a population and the gene pool of the population undergoes variation.
It consider reproductive isolation as a major essential factor in speciation. Darwinism is the theory of biological evolution.
According to this theory, species develop themselves through natural selection of some phenotypic variations which are inherited.
These inherited variations help the individuals to compete, survive and reproduce.
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