anthrolecture

anthrolecture - Anthro 5 lecture 10/09/08 Genes specify the...

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Anthro 5 lecture 10/09/08 Genes specify the recipes for proteins. Proteins interact with each other and with the environment in building the phenotype. Gene action Useful to recognize 2 types of gene action: 1. obligate: resist environmental interference. 2. Facultative: monitor environmental variation and adjust phenotype accordingly. (Planned by selection) Obligate variation can be either: Discrete: just two or a few values Ex) height in Mendel’s peas, pod color, pod size Continuous: many values with no obvious gaps in the distribution. Ex) height in humans. Beak depth is determined by genes at 2 loci facultative example: suntanning Your genes don’t change when you suntan but your phenotype does. It changes by rules coded for in the genes. How does suntanning work? Rate of melanin synthesis (a protein) increases with more UVb exposure. UVb has multiple effects on the body: + necessary for synthesis of vitamin D - causes skin cancer. Too little UVb= vitamin D deficiency
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anthrolecture - Anthro 5 lecture 10/09/08 Genes specify the...

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