Bio II Slide Set IV - SLIDE SET IV Developments Genetic...

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SLIDE SET IV Development’s Genetic “Toolkit”: Developmental Genes & “EVO-DEVO” I. Developmental Genes A. Maternal-effect genes B. Segmentation genes C. Homeotic ( Hox ) genes II. Developmental Genes and Evolution of Body Forms (“Evo-Devo”) A. Role of Hox gene mutations on morphology B. Role of heterochrony Monday, June 13, 2011
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The developmental-Genetic “TOOLKIT” = specific genes that code for proteins that control embryonic development. Theses proteins: 1. act as transcription factors (regulating gene expression) 2. are involved in specific cell-signaling pathways 3. act as cell-adhesion molecules 4. act as cell membrane receptors 5. act as morphogens Monday, June 13, 2011
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I. body plan formation regulated by various developmental genes : A. Maternal effect genes 1. Code for egg CDs direct egg polarity & body plan early in development e.g., the bicoid protein, a morphogen, in Drosophila Segmentation genes : sequential expression of these genes guides the development of an embryo’s body plan, providing positional
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