BIOL 1005 1st Edition Lecture 3Outline of Last Lecture I. Scientific Method II. Scientific Theories and Scientific Laws III. Video by MDCOutline of Current Lecture I. EvolutionII. Divergent EvolutionIII. Convergent EvolutionIV. SturcturesCurrent LectureI. Evolution- Catastrophism: multitude of species created originally but a series of catastrophes removed many and modern day consists of survivorso Not supported by fossil record- Uniformitarianism: Hutton and Lyell 1700’s established that layers of rock and sediment produced naturally which provided the time frame for evolution- Lamark (early 1800) proposed the “inheritance of acquired characteristics” o Living organisms modify their bodies through use or disuse of parts and there modifications can be inherited Does not always hold true Ex: Giraffes evolved long necks because they were always reachingfor food- Alfred Wallace and Charles Darwin both proposed that the mechanism for evolution was natural selectionII. Divergent Evolution: mutations and different selective pressures cause populations to evolve along dissimilar paths- One species can evolve into two speciesIII. Convergent Evolution: unrelated organisms evolve separately to cope with environmental conditions in the same fashion- Look alike – act alike- Two species can be similar through development of analogous structure- Unrelated species in similar environments evolved similar formsThese 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.IV. Structures- Homologous Structures: similar structureso Bat wings and Bird wings (both have bones)- Analogous Structures: may look similar but are not structurally similaro Bird wings and Insect wings - Vestigial Structures: serve no apparent purposeo Hind limb structures of boa and baleeno Embryonic similaritieso DNA similarities in structure and sequenceo Artificial selection:we humans decide who
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