Chapter 23- The Evolution of Populations

Chapter 23- The Evolution of Populations - Chapter 23 The...

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Chapter 23 The Evolution of Populations Evolution occurs in populations, not in individuals Western historical Context Gregor Mendel (1822-1884) o Australian monk whose breeding experiments with peas shed light on the rules of inheritance. o A contemporary of Darwin, but his work was overlooked until the 20 th century The Modern Synthesis (early 1940s) o A conceptual synthesis of Darwinian evolution, Mendelian inheritance, and modern population genetics o Potential for rapid population growth when resources are not limiting (unlimited resources) o Resource availability generally limits population size. o Competition to the resources (struggle for existence) o Phenotype variability (morphology, physiology, behavior, etc.) o Natural Selection: Survival and reproduction of the “fittest” individuals; Artificial Selection- animals breeding; choose what species to breed o Some variability results from heritable genotype differences o Adaptive Evolution: a change in the phenotype constitution of a population owing to selection on heritable variation among phenotypes that changes the genotypic constitution of the population Phenotype vs. Genotype Phenotype- all the expressed traits of an organism Genotype- the genetic make-up of an individual (it’s full complement of genes and the 2 alleles that comprise each locus) Diploid- get 2 copies Evolution- a change in allele frequency in a population (a change in the gene pool) over time Population = all of the individuals of a species in a given area
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Population Genetics - examine the frequency, distribution, and inheritance of alleles within a population Hardy-Weinberg Equilibrium - the population genetics theorem that states that the frequencies of alleles and genotypes in a population will remain constant unless acted upon by non-Mendelian processes… A control situation where no evolution is taking place
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This note was uploaded on 02/05/2011 for the course BIOL 1202 taught by Professor Gregg during the Spring '08 term at LSU.

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Chapter 23- The Evolution of Populations - Chapter 23 The...

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