Three levels of G-band differentiation

G-band "fusions" in the more contracted chromosomes, and G-band "splittings" in the longer chromosomes, have been cited directly or by implication to be natural cyclical states of human chromosomes. This report presents three levels of G-band differentiation producted by a single techinque, and compares them with three corresponding levels of R-band differentiation reported by others. It argues for the possibility of artifactural band "fusion" mechanisms in the more contracted chromosomes.