Biology 1001A Chapter 18: Changes in Population Oct 20
31 Mar 2016
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Why it matters: mtdna single stranded in whales were examined lots of variation possible effects of bottleneck effect reduce variation. Crosses of f1 generation and pure bred are called back crosses. Microevolution change in frequencies of alleles or heritable phenotypic variation in a population over time. Population includes all individuals of a single species that live together same place and time. Microevolution change results from several processes not just natural selection sometimes counteract. Phenotypic variation: differences in appearance or function among individuals of a population. If a difference is heritable it is passed from generation to generation. Important to determine whether environment or genes cause phenotype only. Change however natural selection functions on phenotype: test whether environment or genes by using variables, breeding experiments characters respond to artificial selection, study inheritance pattern. 3 modes of natural selection of phenotypic variation through analysis.
