12-05-11 Evo-Devo I

12-05-11 Evo-Devo I - ZOL445 Evolution December 5, 2011...

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ZOL445 Evolution December 5, 2011 Evo-Devo: Evolutionary Developmental Biology I What is development? Development : Cell division + differentiation Differentiation : The process by which different cells express different genes and become different tissues How does a cell know what it wants to be? Cells know where they are in space and time Ernst Mayr: “The clarification of a biochemical organism by which the genetic program is translated into the phenotype tell us absolutely nothing about the steps by which natural selection has built up a particular genetic program.” In other words, even if you know how development generates a phenotype, this doesn’t tell you how development has evolved to generate phenotypic variation. The genotype-phenotype map: Genotype : Genetic makeup of an organism Phenotype : Physical properties of an organism How does variation in genotype generate variation in phenotype? Macro-evolutionary change: HOX genes
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This note was uploaded on 12/21/2011 for the course ZOL 320 taught by Professor Kopachik during the Fall '11 term at UCSB.

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12-05-11 Evo-Devo I - ZOL445 Evolution December 5, 2011...

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