Bio Notes Feb 7

Bio Notes Feb 7 - Bio Notes Feb 7 CH.25 26 Lecture...

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Bio Notes Feb 7 CH.25 + 26 Lecture materials. We have tons of evidence for evolution. - Homologies - fossil record - biogeography- organisms are very similar in continents that shared some characteristics. - Lot of Molecular Evidence- genetic code that is universal, proteins, the twenty amino acids, organelles, etc. We have gone from allele frequencies in the parental gene pool to genotype frequencies among the offspring. What happens when these offspring reproduce? P +q = 1 When any of the five agents of microevolution take place, evolution will occur. Life is in constant motion. Without genetic variation, evolution cannot accumulate the most favorable traits. - Macroevolution: ---- Extrinsic --- Intrinsic Liger- the offspring is viable and they only occur in captivity-in zoos. Biological Species Concept: --- groups of individuals that potentially or actually can interbreed with each other. ( live in such a close range and meet) --- Most of the time that is only true in nature at the level of a population because not all members will be there. Every creature that is able to interact and mate and create viable and fertile offspring is going to be considered a member of the same species. ---- What are the shortcomings of the biological species concept? Bacteria do not have sex. So we cannot use that definition for that particular application. Bacteria are asexually reproducing. Fossil species needed to be treated differently too and thus they use a different species concept depending on what the are working on.
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Morphological Species Concept- Bases on structure, size anatomy Paleontological Species Concept focuses on fossil species that have distinct morphological character Ecological Species Concept focuses on their differences in their ecological niche. Phylogenetic Species Concept differentiates it according to its genetic history.
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This note was uploaded on 03/19/2012 for the course BISC 1112 taught by Professor Doebel during the Spring '12 term at GWU.

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Bio Notes Feb 7 - Bio Notes Feb 7 CH.25 26 Lecture...

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