Other contributors to foundational concepts and to the final synthesis (see BE , p. 54): George Gaylord Simpson (1944: Tempo and Mode in Evolution ) Bernhard Rensch (1947, tr. 1949: Evolution Above the Species Level ) G. Ledyard Stebbins (1950: Variation and Evolution in Plants ) DARWIN'S THEORY REVISED: A MODERN STATEMENT Five major changes in modern theory as compared with Darwin's theory Process of origin of variation in a population or species Mechanisms maintaining variation Importance of geographic isolation in speciation process Nature of species Time frame for evolution to occur Natural Selection Natural selection is the non-random, differential survival (mortality) and reproduction of individuals (genotypes) carrying alternative, inherited traits, which results in a change of the relative frequency of genotypes due to differences in the ability of their phenotypes to obtain representation in the next generation.
(A MODERN STATEMENT Five major changes in modern theory; compared; with Darwin's theory Process of origin of variation in a population or species) (Mechanisms; maintaining; variation Importance of geographic isolation in speciation process Nature of species) (inherited traits; results; in a change of the relative frequency of genotypes due to differences in the ability of their phenotypes) (Natural Selection Natural selection; is; the non-random, differential survival (mortality) and reproduction of individuals)
A MODERN STATEMENT Five major changes in modern theory Mechanisms inherited traits Natural Selection Natural selection
compared maintaining results is
with Darwin's theory Process of origin of variation in a population or species
variation Importance of geographic isolation in speciation process Nature of species
in a change of the relative frequency of genotypes due to differences in the ability of their phenotypes
the non-random, differential survival (mortality) and reproduction of individuals