PPT-Analyze and evaluate the effects of other evolutionary mechanisms, including genetic

  Unit 11 7F Lets remember An allele is an alternative form of one gene B stands for black b stands for brown The allele would be Genetic Drift An evolutionary mechanism in which allele frequencies change in a population. Shaping evolutionary theory. Slide 1. slide 2. What is an allele again? . It’s an alternative form that a single gene may have for a particular trait. .. Pictured are two homologous chromosomes. Each chromosome has the same type of gene at the same spot. Different versions of this gene are called alleles. These two genes make up this organisms genotype for the trait of flower color.. Genetic Drift (and Inbreeding). DEVIATION. . from . Hardy-Weinberg Equilibrium. Indicates that . EVOLUTION. Is happening. 4 Major Evolutionary Mechanisms that alter allele frequencies in populations:. 23.1 – Mutation & sexual reproduction produce genetic variation that makes evolution possible. 1) Microevolution. Change in the allele frequencies of a population over generations. Evolution on the smallest scale. Paul . Gepts. Plant Sciences, UC Davis. 6. o. . Congreso. . Brasileiro. de . Melhoramento. de . Plantas. 1 a 4 de . agosto. , 2011 – . Búzios. , RJ. Applied Plant Breeding and Cultivar Development . In-build . mechanisms for adaptation. (or evolutionary mechanisms). Biology Stage 3. Text: Chapter 23. Human Biology Stage 3 . Text: Chapter 15. Key ideas. Population genetics. Observable facts. Natural selection. Genetic Drift. Genetic drift is random fluctuation in allele frequency between generations. . The effects of genetic drift are pronounced in small populations. .. A Genetic Bottleneck is a Form of Genetic Drift. Random change in allele frequencies from 1 generation to . the next.. Individuals who survive . & pass on their genes are not necessarily the “fittest” . Leads to a loss of genetic variation. The Process of Speciation . How Common Is Genetic Variation?. Many genes have at least two forms alleles.. All organisms have genetic variation that is “invisible” because it involves small differences in biochemical processes.. .. Evolutionary Forces. Mutation (random). Genetic Drift (random). Gene Flow (random). Sexual Selection (non-random). Genetic Drift. Random, non-selective, changes in allele frequency due to chance. . weinberg. practice . Changes in allele frequencies. Turn in: Comparing AA WS and video notes. Homework. Chp. 20 reading and notes (Due Tuesday). Natural selection video and notes. Hardy-. weinberg. The change in allele frequencies in populations due to . chance. (not selection). . Can include the loss of alleles from the gene pool.. Genetic drift. The change in allele frequencies in populations due to . Answer in writing: . what is DNA? Where is yours? . A . very long macromolecules that contains your genetic material. It’s found in the nucleus of each one of your cells.. A segment of DNA which codes for a protein, which determines a trait.. . Fossils provide a record of evolution. . Paleontology is the study of fossils or extinct organisms.. Paleontology provides evidence to support evolution.. Molecular and genetic evidence support fossil and anatomical evidence. . October 2014. Secondary Science - Biology. investigate and explain cellular processes, including homeostasis, energy conversions, transport of molecules, and synthesis of new molecules.[BIO.4B]. October 2014.