Abstract
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. Three levels of G-band differentiation were produced by a single technique, and the levels were compared with 3 corresponding levels of R-band differentiation reported by others. The possibility of artifactual band fusion mechanisms in the more contracted chromosomes is discussed.