ANT101H5 Lecture Notes - Lecture 9: Ecological Niche, Allele Frequency, Macroevolution
1 Feb 2017
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Document Summary
Human diversity is seen as the result of microevolutionary forces small changes in allele frequencies acting on the human gene pool. Vs macroevolution appearance of new species due to many generational changes in allele frequencies. Do not pass through similar stages during embryonic development organisms do not share a common ancestor. Often called: homoplasy: process that leads to analogy. Structures possessed by 2 different organisms that arise in a similar fashion. Pass through similar stages during embryonic development organisms that share a common ancestor. Determine ancestral versus derived (modified) homologous traits to determine lineage. Clade: a group of organisms with a common ancestor. Looks at two diff types of homologies: modified, and ancestral. A single ancestral species gives rise to 2 or more descendant species. Physical & social barriers, could also be environmental. The new species will not be able to successfully reproduce with each other. Ecological niche the environment in which the specie adapts too.
