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crawhm3 crawhm3
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The abdominal segments of Drosophila have no appendages. Loss of function of bithorax genes results in appendages forming in these abdominal segments.  Therefore, ________.

bithorax mutations are necessarily recessive

bithorax genes normally activate appendage-forming genes

ultrabithorax usually acts to oppose bithorax genes

bithorax normally activates a gene that negatively regulates appendages in the abdomen

▸ expression of bithorax wild-type genes suppresses all appendage formation
Textbook 

Genetic Analysis: An Integrated Approach


Edition: 3rd
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2ne1_123452ne1_12345
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bithorax normally activates a gene that negatively regulates appendages in the abdomen

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