Iowa, illinois, and indiana would experience clouds caused by all of the lifting mechanisms, except

Orthographic Lifting.
 There are four lifting mechanisms that form clouds: Orographic Lifting, Convection, Convergence, and Updraft. Orographic lifting is when air cannot go through a mountain, and so it flows over it. Iowa, Illinois and Indiana are all relatively flat states, without mountain ranges to create orthographic lift.

Crossing over creates new combinations of genes in the gametes that are not found in either parent contributing to genetic diversity