If a Gene in Drosophila Is Expressed Only in Imaginal

question 31

Multiple Choice

If a gene in Drosophila is expressed only in imaginal disc (A) when it begins to differentiate, it is referred to as a homeotic gene. Recessive mutations in such genes often result in loss of function so that the structure does not develop. If a transgenic organism is made in which the gene is expressed in a different imaginal, disc (B) , what is the predicted result?

• A) deregulation of gene expression throughout disc A
• B) loss of function of disc B's primary gene
• C) gain of function of several inappropriate genes in disc A
• D) deregulation of gene expression throughout disc B
• E) gain of function in disc B of some of the structures usually seen in disc A

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