BIOB51H3 Study Guide - Final Guide: Mutation Rate, Mazda Mx-5, Conservation Genetics
14 Dec 2011
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Document Summary
Evolution cannot occur without heritable variation populations, so little variation present in current populations (evolution is a thing of the past!) But we now know that mutation is constantly generating new variants. Historical view: natural selection eliminates most viariation in. This is untrue, mutations always creates variation in a population. Does mutation keep up with selection, does mutations generate new: mutation happens but not at a high rate, very rare variations that new populations. Gene: section of dna that codes for a distinct rna or protein product. Locus: location of a gene on a chromosome. Alleles: versions of the same gene that differ in their base sequence. Mutations; changes in the base sequence of dna. Two ways to measure genetic variation: polymorphism: fraction of genes in a population with at least two alleles, mean heterozygosity (h): mean % individuals heterozygous per locus or, mutations are anything that change the base sequence of dna.
