(a)[1]
Fig. 1.1 shows the root tip of Allium as seen with a microscope using a low-power objective lens. State which region, B, C, or D, should be selected to observe the greatest proportion of cells in stages of mitosis.
(b(i))[3]
Draw a labelled diagram to illustrate the structure of a chromosome during late prophase of mitosis.
(b(ii))[2]
Describe how the nuclear envelope behaves during mitosis.