Darwin and Evolution
Title: Darwin and Evolution
Category: /Science & Technology
Details: Words: 353 | Pages: 1 (approximately 235 words/page)
Darwin and Evolution
Category: /Science & Technology
Details: Words: 353 | Pages: 1 (approximately 235 words/page)
Let us begin with Darwin. Darwin provided two important concepts (in his The Origin of
Species, 1859) for evolutionary theory: 1) descent with modification, and 2) natural
selection acts on individual variation. These indicate that evolution (or change) occurs
through the mechanism of natural selection acting on the variation present in a species.
What Darwin didn't know was how variation was passed to the offspring from the
parents. Mendel discovered how this happens through his work on pea
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Evolutionary Biology (1998)
textbook, about 20 tenets of the modern synthesis are listed. Here are some of the more
important ones: 1) populations contain genetic variation (from either mutation or
recombination), 2) populations evolve by changes in gene frequencies driven by natural
selection or drift, 3) evolution commonly occurs through gradual phenotypic change
(adaptive variations have small effects), 4) diversification results from speciation, which
involves the evolution of reproductive isolation, and 5) all of the above generally occurs
over long time periods