BIOL 1103 1st Edition Lecture 20 Outline of Last Lecture I Darwin s Family II Education III Fitzroy and The Beagle IV Darwin s Life Outline of Current Lecture I II III IV V VI Science and Religion Time Mechanism of Evolution Darwin s Conclusions Favorable Variations Evidence for Evolution Current Lecture Science and Religion o Science is investigated by the senses and religion is not therefore it is important to keep science separate from religion and beliefs Time o The earth is 4 6 billion years old o First organisms prokaryotes arose about 3 5 billion years ago o Humans have been on earth for an estimated 100 000 yrs These notes represent a detailed interpretation of the professor s lecture GradeBuddy is best used as a supplement to your own notes not as a substitute o Mechanism of Evolution o Jean Baptiste Lamarck was first to really investigate and create a mechanism for evolution o He concluded from his study of giraffes that new structures arise from need and there is an inheritance of acquired characteristics o Darwin s Conclusions o These were published in Origin of Species o 1 Individuals of any population vary from one another in many characteristics Even siblings differ o 2 These variations can be inherited o 3 Members of a population produce more offspring than the environment can support o 4 Those individuals whose inherited characteristics fit them best to their environment are likely to leave more offspring than less fit individuals Favorable Variations o Variations that favor reproduction More food Longer life Attract opposite sex Ability to exploit new areas o All you need is one survivor Evidence for Evolution o Radiometric dating radiometric dating has confirmed the immense age of the Earth an age that is consistent with the long periods of time scientists believe it has taken species to evolve o Fossils around the globe fossils from the same evolutionary periods are consistently found together in geologic strata there is excellent agreement between the relative ages assigned to fossils by evolutionary theory and the absolute ages assigned to them by radiometric dating o comparative morphology the theory of evolution explains the common occurrence of homologous physical structures in different organisms o Evidence from biogeography island biogeography the geographic distribution of species on Earth s islands is explained by the theory of evolution o gene modification variations found in the DNA sequences of various organisms are consistent with evolutionary theory o experimental evidence experimental demonstrations of evolution have been carried out in the laboratory and in nature
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