BIO 5 Development in Evolution notes

BIO 5 Development in Evolution notes - 5. different cells...

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Sheet1 Page 1 lecture 5: development in evolution 1. study of development reveals the new features that arise from descendents of ancestors a. adaptive radiation: rapid disersivication in a lineage (when a species gives rise to different variants\ b. ancestor is short beak --> through adaptive radiation that affects rate of development --> beak grows faster than the body 2. developmental pathways: patterns of relatedness (parallelism) a. example: frogs and salamander (ancestor is 5 feet --> they both now have 4 feet/ fingers) b. similar to convergent evolution (two things share same chars) --> but parrallelism, same shared chars are attained from diff e c. in the case of frogs and salamander, during embrionic development, differnt digits of figers is lost so that they both now hav e 3. developmental pathways put constraints upon variants 4. ontogeny --> development from egg to adult a. cell develops --> growth (divides), diversify (differentiated), organize (morphogenesis)
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Unformatted text preview: 5. different cells --> specialize in their work (so that they only read the instructions/ gene that they specialize) a. skill cells don't produce liver enzymes/ etc 6. what controls the expression of different genes / what turns this off or on? a. regulatory/control genes --> produce transcription factors (protein) b. transcription factor binds the rna polymerase to the gene that needs to be transcribed. 7. how development build an organism? a. whether you are plant or animals, the regulatory genes are involved in the development because both plants and animals h a b. there are lots of things that need to be defined: growth, circulatory systhem, symmetry, etc. 8. hox gene: homeotic box genes (regulatory/ control gene in animals) a. mutation in hox gene (which produce transcription factor --> affects the reading of particular/ specific gene): results in weird g b....
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This note was uploaded on 04/25/2010 for the course BIOLOGY BIO153 taught by Professor Cordon during the Fall '10 term at University of Toronto- Toronto.

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