Warning:
JavaScript is turned OFF. None of the links on this page will work until it is reactivated.
If you need help turning JavaScript On, click here.
This Concept Map, created with IHMC CmapTools, has information related to: Chapter 23, Genetic drift: unpredictable fluctuations in allele frequencies from one generation to the next. 2 situations can increase genetic drift: Founder effect: when individuals are isolated from a larger population and establish new population whose gene pool is not reflective of source population., natural selection:described as the fitness or contribution an individual makes to the gene pool of the next generation. cant make organisms perfect. 4 reasons why: 1) Evolution is limited on historical constraints., Evolution of Populations types of selection: sexual selection, natural selection:described as the fitness or contribution an individual makes to the gene pool of the next generation. types of natural selection: Stabilizing selection: acts against extreme phenotypes and favors intermediate variants, a localized group of individuals that are capable of inter breeding, and producing offspring in populations... genes aggregate or form a gene pool. gene pools consist of all alleles at all gene loci in individuals of a population., Evolution of Populations Preservations of variation: neutral variation: genetic diversity that that doesnt result in anything, Evolution of Populations theories of evolution... Blending hypothesis: proposed that traits of parents blended in the offspring., study of how populations change genetically over time. this study gave rise to... modern synthesis: a comprehensive theory of evolution that intergrated ideas from other fields., Blending hypothesis: proposed that traits of parents blended in the offspring. hypothesis by... Darwin, mutations: new genes and new alleles by changes in the nucleotide sequence of DNA. one type of mutation point mutation: change in a gene at a single nucleotide pair., Genetic drift: unpredictable fluctuations in allele frequencies from one generation to the next. 2 situations can increase genetic drift: Bottle neck affect: resulting from reduction of a population and the remaining population is no longer genetically represented from original population, sexual selection 3 types of selection: Sexual dimorphism: marked differences between the sexes in secondary sexual characteristics, Evolution of Populations different types of variation... phenotypic polymorphism: two or more distinct changes on characters represented in high enough frequencies to be noticeable, Evolution of Populations theories of evolution... Hardy Weinberg theorom of equilibrium, genes aggregate or form a gene pool. gene pools consist of all alleles at all gene loci in individuals of a population. one type of allele... Fixed alleles: if only one allele is said to be in the gene pool the all individuals are homozygous for that allele., Evolution of Populations variations in genes can occur by.... Duplication: abberration in chromosome structure due to fusion with a fragment from homologous chromosomes., sexual selection 3 types of selection: intersexual selection: mate choice, individual chooses other sex., Evolution of Populations Preservations of variation: balancing slection: occurs when natural selection maintains stable frequenciesof two or more phenotypic forms in a population., Evolution of Populations variations in genes can occur by.... Genetic drift: unpredictable fluctuations in allele frequencies from one generation to the next., Evolution of Populations variations in genes can occur by.... mutations: new genes and new alleles by changes in the nucleotide sequence of DNA.