In a normal fruit fly (Drosophila), the second thoracic segment has wings and the third thoracic segment has halteres (small knobbed structures that act as a balance and guidance system). A mutant fruit fly is identified in which the third thoracic segment produces wings instead of halteres. This abnormal fly has a mutation in which of the following?

A. a homeotic gene
B. a segment polarity gene
C. a maternal effect gene
D. a gap gene


Answer: A

Biology & Microbiology

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