Evidence of Evolution Notes

Evidence of Evolution Notes - wings of ostriches-Homologous...

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Evidence of Evolution 1. Adaptations - Mimicry: structural adaptation that enables one species to resemble another species - Camouflage: adaptation that enables species to blend with their surroundings 2. Fossils: traces of organisms that existed in the past - provide a record of early life and evolutionary life - Paleontology: the study of fossils or extinct organisms 3. Embryos- the earliest stage of growth and development of both plants and animals - Early in development, vertebrate embryos have similar characteristics. As development continues, various structures are modified until they take on their characteristic adult forms. - Similar features in very different organisms suggest evolution from a distant common ancestor. 4. Anatomy - Vestigial structures: structures that are present in an organism but are reduced in size and either have no use or have a less important function than they do in other, related organisms. Example: snakes have tiny pelvic bones & hind limbs;
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Unformatted text preview: wings of ostriches-Homologous structures: features that are similar in structure but appear in different organisms and have different functions Example: Forelimbs of tetrapod vertebrates (humans, bats & moles)- Analogous structures: structures that perform a similar function but are not similar in origin Example: Wings of bat (have bones), wings of insects (only membranes)-----These evolved separately 5. Biochemistry- Comparisons of the DNA or RNA of different species produce biochemical evidence for evolution. - DNA Sequence Analysis: The more related two organisms are, the more similar their DNA will be- Pseudogenes: Sequences of DNA that no longer function, but are still passed on through generations. Similarities reflect a common ancestor- Protein Comparisons: Cells from different species that have the same proteins most likely came from a common ancestor...
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This note was uploaded on 04/05/2011 for the course BIOL 2112 taught by Professor Deidra during the Spring '11 term at CSU Sacramento.

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Evidence of Evolution Notes - wings of ostriches-Homologous...

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