L7 Evo & Develop 3-11

L7 Evo & Develop 3-11 - 4/14/11 1 Lecture 7:...

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Unformatted text preview: 4/14/11 1 Lecture 7: Development and Evolution Development and Evolution- History • 19 th c- embryology important development not part of modern synthesis little communication between geneticists and developmental biologists Development and Evolution- History • ontogeny (development of an organism) recapitulates phylogeny (ancestor-descendant relationships) Haeckel ` s biogenic law • Von Baer ` s observations counter recapitulation (no functional equivalent of fish, amphibian, reptile stage in humans) Development and Evolution-History • Development and evolution in quantitative, descriptive context • 20 c. -D ` Arcy Thompson-changes in form by geometric transformation but no identification of how changes occur (developmental mechanisms) • Individualization • Heterochrony • Hox genes Development and Evolution Development and Evolution Genotype Phenotype Environment 4/14/11 2 Development and Evolution Genotype Phenotype Selection Environment Development and Evolution Genotype Phenotype Selection Development Environment Development and Evolution Two reasons evolutionists are interested in development: – minor changes in regulatory genes can have major effects on phenotypes – development may constrain morphological evolution Development and Evolution Traditional Studies: description of morphology and embryology More recently: molecular biology is revealing how genes effect development Development and Evolution Patterns of Morphological Evolution Individualization Many structures are uniform and repeated, they develop into the same form. Examples: legs in some insects, leaves of a tree, teeth in reptiles Individualization homodont dentition in early reptile 4/14/11 2 Development and Evolution Genotype Phenotype Selection Environment Development and Evolution Genotype Phenotype Selection Development Environment Development and Evolution Two reasons evolutionists are interested in development: – minor changes in regulatory genes can have major effects on phenotypes – development may constrain morphological evolution Development and Evolution Traditional Studies: description of morphology and embryology More recently: molecular biology is revealing how genes effect development Development and Evolution Patterns of Morphological Evolution Individualization Many structures are uniform and repeated, they develop...
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This note was uploaded on 05/07/2011 for the course BIOLOGY 352 taught by Professor Townsend during the Spring '08 term at San Diego State.

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L7 Evo & Develop 3-11 - 4/14/11 1 Lecture 7:...

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