CHAPTER 6
(Pg. 120-125)
REVISIONS OF DARWIN'S THEORY
NEO-DARWINISM
Most serious weakness in Darwin's theory was his failure to identify correctly the
mechanism of inheritance.
He saw heredity as a blending phenomenon
Neo-Darwinism: Darwin's theory as revised by Weismann
~ Darwin's original theory(Lamarckian inheritance) was rejected by Weismann
who experimentally showed that modifications of an organism during its
lifetime do not change its heredity.
EMERGENCE OF MODERN DARWINISM: THE SYNTHETIC THEORY
Population geneticists study evolution as a change in genetic composition of
populations.
With the establishment of population genetics, evolutionary biology became divided
into two different subfields:
Microevolution: pertains to evolutionary changes in frequencies of different allelic forms of genes
Macroevolution: refers to evolution on a grand scale, encompassing the origins of new organismal......
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