Fig. 10. (A) Plot of pole-to-pole distances (open circles) and of distances from the poles of sex-chromosome kinetochores (open and closed triangles, representing partner kinetochores) as a function of autosomal interkinetochore distance (abscissa), for which we used average distances as described in Fig. 9. The lines represent our interpretation: that the poles elongate early in anaphase but not later, and that the sex chromosomes do not move polewards (they remain a constant distance from the poles). (B) The same set of cells, with open circles representing pole-to-pole distances and crosses representing the average distances of the autosomal kinetochores from the spindle poles in these same cells. The lines indicate our interpretation: that autosomal separation during early anaphase is due to spindle elongation and separation later in anaphase is due to movement towards the pole.