BIOL 1202 Lecture : BIOL 1202 Class Notes 1 31 13
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Evolution: a change in the phenotypic constitution of a population over time owing to a selection on heritable variation among phenotypes that changes the genotypic constitution of the population. Population genetics: examines the frequency, distribution, and inheritance of alleles within a population: gregor mendel didn"t know about dna. Now: 500 plants total, each carry two copies of the gene, so 1000 genes. 320 (must count for both copies of dominant allele, so ) + 320 + 160 = 800 copies of dominant allele: so frequency of dominant allele = 800/1000 = 0. 8 p = frequency of dominant allele (0. 8) q = frequency of recessive allele (o. 2, p + q must equal 1. 0. Allele frequencies = under strict mendelian inheritance, allele frequencies would remain constant from one generation to the next (hardy-weinberg equation) this means there"s no evolution (if no change in allele frequency over time: the converse: if a pop. Is not in hw equilibrium, it"s evolving: hw equ.
