LIFE 121 Lecture Notes - Lecture 3: Allele Frequency, Geologic Time Scale, Macroevolution
Document Summary
Evolution: jean baptise lamarck french naturalist (1744-1829, proposed that organisms change over time as result interaction with their environment. By using or not using body parts, an individual develops traits which it passes on to its offspring. Charles darwin (1808-1882) -british naturalist: wrote origin of species by means of natural selection, voyage of hms beagle (1831-1836, key stop was in the galapagos islands. Darwin"s observations: all species tend to produce excessive numbers of offspring competition for limited resources. This led for a struggle for existence among individuals in population: individuals in populations highly variable traits which passed on generation to generation. Darwin"s hypothesis: all organisms related through descent from some common ancestor, over millions years, descendent of earliest organisms: Accumulated modifications (adaptions) which made them better able to survive in those diverse habitats. *****makeup populations of organism changed over time: natural selection: mechanism causing this change in population over time.
