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The bithorax mutation in Drosophila

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(a) A normal fly has two wings on the second thoracic segment, and two halteres on the third thoracic segment. (b) This mutant fly contains mutations in a complex of genes called the bithorax complex. In this fly, the third thoracic segment has the same characteristics as the second thoracic segment, thereby producing a fly with four wings instead of two
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