For G natural minor (G, A, B b , C, D, E b , F) you end up with Dm (V) going to Gm (I). The solution was to raise the seventh note to give the harmonic minor - the notes in G harmonic minor are G, A, ...

Our A minor pentatonic and A natural minor scales by contrast feature a b7th interval, or G natural. So the Harmonic Minor’s G# sits perfectly over the E7 chord, outlining its major 3rd.

Referring back to Figure 1, we can view the range of chord possibilities relating to our key center — incorporating “modal interchange” between D natural minor, D harmonic minor, and D Dorian.