BIOL 1202 Chapter : Chapter 23 The Evolution Of Populations
Document Summary
One common misconception about evolution is that individual organisms evolve during their lifetime. Evolutionary processes (e. g. , natural selection) acts on individuals, but populations evolve. Mutations: changes in nucleotide sequence of dna (source of new alleles and genes) Point mutation: change in one nucleotide base in a gene. Chromosomal mutations: delete, disrupt, or rearrange many loci on a chromosome. Gene duplications: duplication of whole segments of a chromosome. Mutation rate averages 1 in every 100,000 genes per generation. In sexually reproducing organisms, sexual recombination produces most of the variability in each generation. Concept 23. 2: the hardy-weinberg equation can be used to test whether a population is evolving. 23. 6: no mutations, large population size, no gene flow, no natural selection, random mating. Population: a group of individuals of the same species living in a certain defined area. H-w equilibrium: describes a population that is not evolving (i. e. allele frequencies don"t change) Frequency of homozygotes with this disorder is q^2=0. 0001.
