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BILDSTUDY2 - a Examples human goose bumps useful for dogs...

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Lecture 3 Evidence of Evolution 1. Evolution – genetic change over time [ know the question that follows] a. Populations evolve not individuals 2. Extinction was proved by fossils first found was the Irish elk and proved by George Cuvier who showed the Irish Elk was unlike modern animals. 3. Law of succession: fossils in one region is similar to the animals within that region 4. Transitional forms – are organisms that have characteristics of modern and ancestral forms [link between modern and ancestral species] a. Tiktaalik was the transitional form for aquatic to land dwelling vertebrates in 2006 i. Found in Canadian Arctic ii. Details in note look at it slide 4 iii. It is not ancestor of modern tetrapods(4- legged land animals) b. Archaeopteryx was transitional form for dinosaurs and birds i. Details in notes slide 5 5. Vestigial Organs – are useless organs in one species that maybe important in another spcies i.e fish with eyes “blind cave tetra” & “dodo birds”
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Unformatted text preview: a. Examples: human goose bumps[ useful for dogs so they look bigger etc.] also wisdom teeth was useful for cave mens diet. 6. Homology- similarity due to inheritance from common ancestor a. Structural homology: mammalian forelimbs for human arms, whale fins and bat wings. Which proved for common ancestry b. Developmental homology similarities during development such as embryos of chickens and humans[both have a tail and pharyngea pouches] c. Molecular homology: similiarites at the molecular level such as genetic code and genetic flaws [ chromosome 17 in humans] look at slide 4 i. Used for drug tests on rats and cotton to kill pests etc. 7. Direction observation of changes in skypilot flowers who are pollinated by bumblebees are bigger than randomly pollinated ones in the timberline....
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