GE CLST 70A Lecture Notes - Lecture 3: August Weismann, Blending Inheritance, Transitional Fossil
27 Jan 2016
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Document Summary
Typological thinking (essentialism) was still a reigning notion. All that matters is the ideal form, the type. But darwin rejected this notion instead, he considered populations to be the important units. He saw no constant classes of organisms; rather there are variable populations. The ideal of a species does not exist and is uninteresting. Presence of tiny adult within sperm or egg (homunculus). Blending inheritance: would result in character dilution, & doesn"t accepted explain traits that disappear and reappear. August weismann- disproved theory of inheritance (lamarck) 1. and one recessive (alleles) occurs via transmission of particles (particulate inheritance) consistent with microevolution process mechanism for evolution of new species. Cut off tails of mice, alteration was not passed on to offspring. Gregor mendel: pea breeding experiment, proposing that inheritance. Every individual has two alternate expressions of genes, one dominant. George gaylord simson: macroevolution in the fossil record is. Ernst mayr: systematics and the origin of species.
