Suppose you found several Drosophila mutants that possessed additional legs growing out of the head segments. The probable mutation would be found in
A) homeotic genes.
B) gap genes.
C) pair- rule genes.
D) segment- polarity genes.

Question

Quizplus · Accepted Answer

Homeotic genes determine the identity of each segment in an organism's body plan, and therefore mutations in these genes can lead to abnormal development of body structures. In the case of Drosophila mutants that possess additional legs growing out of the head segments, a mutation in homeotic genes is the most likely explanation. The formation of additional legs suggests a transformation of head segments into thoracic segments, where legs are normally found.

Suppose You Found Several Drosophila Mutants That Possessed Additional Legs