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) loss of function of disc B's primary gene

b) deregulation of gene expression throughout disc B

c) gain of function of several inappropriate genes in disc A

d) deregulation of gene expression throughout disc A

e) gain of function in disc B of some of the structures usually seen in disc A