O

odd-skipped gene 42 Odd-skipped (Odd) protein 66 Olenoides serratus 3 omg gene 79 onychophora 105, 242

diversity of segment types 8 Dll expression 126, 145 fossil record 3 Hox genes 114-16, 115 limb development 144, 145 morphological diversity 133, 138 phylogenetic relationships 6, 7, 107

segmentation genes 134

trunk Hox gene orthologs 136, 136-8

Ubx protein 144, 145, 146 optomotor-blind (omb) gene 79 oral-aboral axis 183, 185, 242 Ordovician 242 organizers 18-20, 19, 242 signaling proteins 50, 50 vertebrate embryos 19 Origin of Species (Darwin) 235 origins of animals 2 -6 orthodenticle gene 135 orthologous genes (orthologs) 108-9, 110, 242

conserved biochemical functions 120-1 divergence 112-13 Osr genes 42 outgroups 105, 242

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