Difference between Darwinism and
Neo-Darwinism
The evolutionary idea contributed proposed by Charles Darwin
called ‘Darwinism’ or Natural selection
theory, explaining the mechanism of evolution is clearly
stated in his book ‘ Origin of species’.
The important postulates of the theory are: Over production,
Struggle for existence, Variations, Survival of
the fittest, and Origin of species.
Neo-Darwinism
The recent supporters of Darwinism modified the theory
according to the latest development in biology.
This modified theory is called Neo- Darwinism or Modern
synthetic theory of Natural selection.
A few Neo Darwinism Supporters are Romanes, Wallace, Fisher,
Huxley, Ford, Haldane, Goldschmidt,
Sewall Wright, Ernst Haeckel, August Weismann, Mendel,
Dobazhansky , Kettlewell and Herbert Spencer.
The Neo Darwinism has the following ideas: Experimental
evidences and Answers to the objections
Darwinism vs Neo-Darwinism
Darwinism
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Neo-Darwinism
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1. It is the original concept postulated by Darwin and
Wallace to explain the mode of speciation
2. It considers all inheritable favourable variation
3. It does not explain the reason for variation
4. In Darwin’s theory, the basic unit of evolution is
an individual
5. It does not consider reproductive isolation as a
major factor in new species formation
6. In Darwin’s theory, natural selection is the
survival of the fittest and removal of the unfit ones during the
course of time
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1. It is the modification of original concept
postulated by Darwin and Wallace based on data obtained from
genetic research
2. It considers only inheritable genetic variation
(mutations) for evolution
3. It explains the reason for variations
4. In Neo-Darwinism, the basic unit of evolution is a
population
5. It consider reproductive isolation as a major essential
factor in speciation
6. In Neo-Darwinism, natural selection refers to the
differential reproduction leading to the changes in gene
frequency
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