092707_PhylogenyI - Intro to Organismal Biology...

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9/27/2007 1 9/27/07 Intro to Organismal Biology Announcements 2 Study guide for Exam 1 : Will be posted under “Course Documents” Virtual Office hours : Post questions to Discussion Board this weekend--I will post responses on Sunday. Lab 3 : Results and Discussion due in two weeks (week of Oct 8) Turn in to lab instructor (drop in box on office door) by start of normal lab time Today’s class Evolutionary novelty due to changes in developmental genes, continued Reconstructing evolutionary history: Phylogeny and systematics (Relevant reading: Ch. 24, 25) 3 Evolutionary novelty: Changes in developmental genes (“ Evo-Devo ”) Developmental genes control multiple aspects of growth from zygote to adult: Rate Timing Spatial pattern Slight genetic differences in genes that control development can lead to major morphological differences. 4 Spatial pattern of development Homeotic genes : “toolkit” genes determine the spatial pattern of body parts Ex. : Hox genes in animal embryos 5 Spatial pattern of development 6
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