Biological Anthropology Notes 5

Biological Anthropology Notes 5 - Biological Anthropology...

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Biological Anthropology Notes October 25, 2006 - Evolutionary Scale o Micro and macro evolution Micro evolution: below species level Macro evolution: above the species level o Taxonomy Linnaeus invented this system Taxa are categories Hierarchical organization Higher categories are more inclusive X is a kind of Y Taxa reflect evolutionary relationships Kingdom Phylum Class Order Family Genus Species o Kings play chess on fertile green soil Binomial nomenclature Genus species or Genus species o Homo sapiens Short expression: H. sapiens o Species and speciation Biological species A group of interbreeding populations that are reproductively isolated from other such groups Speciation One species splits into two Involves reproductive isolating mechanisms o Reproductive Isolating mechanisms Extrinsic and intrinsic Extrinsic Factors that promote geographic isolation Physical barrier that divides populations o Such as movement of the tectonic plates Intrinsic Does not depend on a physical barrier o Such as seasonal reproductive isolation
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Have different reproduction times, one tree does it in spring, the other does it in the fall Pre-zygotic mechanisms o Sperm does not get to the egg at all Post-zygotic mechanisms o Sperm does get to the egg, but things happen Hybrid species is infertile Spontaneous abortion of the fetus due to
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This note was uploaded on 04/05/2008 for the course ANTHRO 2B taught by Professor Egan during the Spring '08 term at UC Irvine.

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Biological Anthropology Notes 5 - Biological Anthropology...

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