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Unformatted text preview: is already externally divided into 14 segments from ante- rior to posterior3 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 AP Axis Genes That Contribute to Pattern Formation Role(s) in early Gene symbol Gene name Protein function development hb-z hunchback-zygotic Transcription factorzinc-finger protein Gap gene Kr Krppel Transcription factorzinc-finger protein Gap gene kni knirps Transcription factorsteroid receptor-type protein Gap gene eve even-skipped Transcription factorhomeodomain protein Pair-rule gene ftz fushi tarazu Transcription factorhomeodomain protein Pair-rule gene opa odd-paired Transcription factorzinc-finger protein Pair-rule gene prd paired Transcription factorPHOX protein Pair-rule gene en engrailed Transcription factorhomeodomain protein Segment-polarity gene ci cubitus-interruptus Transcription factorzinc-finger protein...
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- Spring '08