Figure 2.—

Schematic for the spread of an element construct incorporating dissociation of the resistance gene. An individual having two copies of the intact construct (TER) and two copies of the dissociated construct (TE) can gain a copy of either through transposition and lose a copy of either through deletion. The proportion of individuals having this genotype can also increase or decrease as a result of transposition or deletion. Dissociation is a one-way process leading to a TER becoming a TE. Analogous schematics can be drawn for every other genotype.