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Download Evidence of Evolution Notes Descent with Modification Each living
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Evidence of Evolution Notes Descent with Modification Each living species has descended, with _____________________, from other species over time. o Result: species today look/act _____________________________ from their ancestors Common Descent: Logic: looking far enough back we should find the common __________________________________ for all living things. Evidence for Evolution Fossil Records o Compare fossils found around the world and we can infer when and where different organisms existed. o Fossils also provide evidence about the environment in which the organism existed and for which the organism adapted o The oldest fossils are found in the ___________________________ layers. Transitional Species o Fossil records show species which have features that are intermediate between those of hypothesized ancestors and later descendant species Homologous Body Structures o The limbs of reptiles, birds and mammals (arms, wings, legs and flippers) vary greatly in __________________________ but have the same ________________________________ Evidence of Evolution Notes Analogous Body Structures o The wings of bats, birds and moths have different __________________________________, but the same basic ________________________________ Vestigial Structures o Organs / body parts that were once used, but by _________________________ or artificial selection, are no longer _____________________________ o Examples: Hip bone in a whale, appendix in humans, tail bone in humans, plica luminaris (3rd eyelid) Comparative Embryology o The early stages, or embryos, of many animals with backbones are very similar. o The same groups of embryonic cells develop in the same ___________________________ and in similar ________________________ to produce the tissues and organs of all vertebrates. Molecular Biology o Using new technology, we can see how many DNA and RNA sequences organisms share in common o Amino acid sequences used to determine how closely related different species are. Which species are most closely related in the chart?
