anth200jan28

anth200jan28 - (Haploids). gametrs (oocyte or spermatocyte...

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ANTH 200 January 28, 2008 Genotype versus Phenotype Genotype – genetic characteristics or composition of an organism, inherit it from your parents. Unchanged from conception to death Phenotype – genotype + environmentally induced changes = organism’s appearance Natural selection operates on the Phenotype Adaptation Everything about you is an adaptation = any trait that confers enhanced fitness (= reproductive success) on an organism DNA Replication A Bases = Adenine, Guanine, Thymine, Cytosine RNA, Uracil replaces Thymine Protein Synthesis Mitosis: 2 indentical, diploid somatic daughter cells are created from one diploid mother cell. Difference between mitosis and meiosis Mitosis - each chromosome copies itself, then a division into 2 identical daughter cells that are each 46 (diploid) Meiosis - it is what happens in the sex cells, it involves 1 additional division. at the end of meisosis you end up with 4 cells with each 23 chromosomes
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Unformatted text preview: (Haploids). gametrs (oocyte or spermatocyte plus polar bodies) Chromosomes (23 pairs) Some diploid chromosome karyotypes- Humans = 46- Chimpanzees = 48- Gorillas = 48- Gibbons = Reproductive Asymmetry- in higher animals, males have a fvastly greater reproductive potential than females do, and males also have a vastly greater potential variance in reproductive success.- this asymmetry has led to the evolution of very different strategies of reproduction in males versus females. Sexual Selection (Darwin 1871)- Differential reproductive success among the members of the same sex.- Sexual Selection causes males and females to evolve different body sizes, shapes and features (canine teeth, musculature, antlers, manes, etc.) = Sexual Dimorphism Male weapons Canine Teeth, sexual displays Body Size...
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This note was uploaded on 09/03/2009 for the course ANTH 200 taught by Professor Stanford during the Fall '08 term at USC.

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anth200jan28 - (Haploids). gametrs (oocyte or spermatocyte...

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