BIO152H5 Lecture 12: LECTURE 12.docx
Document Summary
Lecture 12: the nature of natural selection and adaptation. Outline: evolutionary mechanisms: lamarck/darwin/wallace && addressing misconceptions - indvidiuals vs. populations && adaptation - acclimation && traits and adaptations 7 traits constraints tradeoffs. He said that individuals change during life time in response to their environment and changed traits are passed to offspring. Produce more complex species over time. ex. giraffes produce offspring w/ long necks. Wallace : individuals do not change, better adapted individuals produce more offspring. Genetic makeup of individuals in population changes as adaptation leads to more surviving offspring. ex. beaks of adult individual finches did not change with changing environmental conditions. Differential reproductive success resulted in a population of offspring w/ diff sized beaks. ex. gene for tb resistance was not induced by the presence of rifampin. Each m. tuberculosis cell had same polymerase alleles. But because mutant frequency changed over time, characteristic of bacterial pop changed.
