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Chapter 20 - Ingrid Shih BIO 1306-04 14 February 2011...

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Ingrid Shih BIO 1306-04 14 February 2011 Chapter 20- Development and Evolutionary Change 20.1- What is Evo-Devo? Evolutionary developmental biology The modern study of evolution and development Share molecular mechanisms for morphogenesis and pattern formation Changes in gene expression o In location o In timing o Important in distinguishing organ systems in a organism or distinguishing similarities b/t different organisms Important in the evolution of new body Findings: o Modifications of existing development genes large morphological change o Development often evolved to be responsive to environment o Modularity: independent developmental processes o Genetic toolkit: conserved DNA sequences that control development shared among multicellular organisms o Evolutionary mod of tool kit- remarkable diversity organisms in the world today The Hox gene cluster- Homologous across variety of animals
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