Practise chromosome organisation, DNA replication, mitosis and cytokinesis while linking controlled division to growth, repair and stem cells, and failed control to tumours.
During interphase of the cell cycle, individual chromosomes cannot be seen within the nucleus. The genetic material is termed chromatin during this stage.
Changes occur to chromatin during mitosis so that chromosomes become visible.
State what happens to chromatin so that individual chromosomes can be seen during mitosis.
Fig. 5.1 is a transmission electron micrograph of two human chromosomes at metaphase of mitosis.
magnification \(=\times 14000\)
Describe the structure of chromosomes at metaphase, such as the two chromosomes shown in Fig. 5.1.