A mutation that results in the transformation of one body part into another.
A mutation that causes the cells of an embryo to give rise to an inappropriate structure in the adult, for example, to legs instead of antennae. (More? Fly Notes)
Mutation that causes cells in one region of the body to behave as though they were located in another, causing bizarre disturbance of the body plan.
A mutation that causes a body part to develop in an inappropriate position in an organism, such as the mutation in Drosophila that causes legs to develop on the head in place of antennae.
A mutation in a homeotic gene that is responsible for controlling the activities of numerous other genes, usually during embryologic development in higher organisms.
Any mutation that disrupts a developmental pathway involved in determining spatial relationships of tissues and body parts