BIOA01H3 Study Guide - Final Guide: Euryarchaeota, Carrageenan, Foraminifera

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9 Dec 2013
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BIOA01H3 Full Course Notes
BIOA01H3 Full Course Notes
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Bio evolution: change in allele frequencies in populations over time individuals are not evolving, over generations. Microevolution: changes within a species, by natural selection: evolution requires heritable changes in dna to be passed down generations. 4 major forces of evolution: mutation, genetic drift, migration, natural selection. It was the first antibiotic drug based on a naturally occurring substance. After 4 years of use, 14% staphylococcus strains were resistant to the drug. By 1950, over 50% of strains were resistant: zone of inhibited growth: on a petri dish, penicillum mold emits a chemical that kills nearby staphylococcus, antibiotic resistance is an example of microevolution by natural selection. Population: individuals of a species in the same place at the same time. Phenotypic variation: heritable variation in appearance and/or function; phenotypic plasticity. Quantitative variation: characteristics with a range of variation controlled by multiple genes; measured data.