Unformatted text preview: is already externally divided into 14 segments from ante- rior to posterior—3 head, 3 thoracic, and 8 abdominal segments (Figure 18-21b ). By this time, each segment 592 Chapter 18 • The Genetic Basis of Development Examples of Drosophila A–P Axis Genes That Contribute to Pattern Formation Role(s) in early Gene symbol Gene name Protein function development hb-z hunchback-zygotic Transcription factor—zinc-finger protein Gap gene Kr Krüppel Transcription factor—zinc-finger protein Gap gene kni knirps Transcription factor—steroid receptor-type protein Gap gene eve even-skipped Transcription factor—homeodomain protein Pair-rule gene ftz fushi tarazu Transcription factor—homeodomain protein Pair-rule gene opa odd-paired Transcription factor—zinc-finger protein Pair-rule gene prd paired Transcription factor—PHOX protein Pair-rule gene en engrailed Transcription factor—homeodomain protein Segment-polarity gene ci cubitus-interruptus Transcription factor—zinc-finger protein...
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This note was uploaded on 01/10/2011 for the course BIOL BIOL taught by Professor Johnson during the Spring '08 term at Aberystwyth University.
- Spring '08