BIOL 2153 Chapter : CH 7 1
Document Summary
Darwinian view of life: change over time (time organized in generations) of genetic composition of population. Example: change in gene frequencies: decent of modern organisms with modification from pre-existing organisms. Accumulation of inherited characteristics that enhance organisms" ability to survive in a. Use and disuse: bodies of living organisms are modified through the use or disuse of parts. Inheritance of acquired characteristics: these modifications are inherited by offspring. Lamarck first came across these ideas while doing an experiment on giraffes. In the past, giraffes were shorter, having shorter necks and legs. Lamarck believed that due to the parents" stretching of their necks and legs to reach leaves, the offspring came out with longer necks and legs. Darwin and wallace developed the theory independently (yet simultaneously: darwin- voyage of the beagle, wallace- naturalist in indonesia. Process selects from what is available in gene pool. New characteristics are not created on demand.
