(a(i))[1]
State how the mass of DNA has changed immediately before mitosis in Fig. 5.1.
(a(ii))[1]
Estimate the time at which the chromosomes in Fig. 5.1 start to separate.
(b)[3]
Describe the differences between the nuclei in cells formed by meiosis and the nuclei in cells formed by mitosis.
(c)[2]
Describe the function of stem cells in embryo growth.
(d)[6]
Outline the events that occur during labour and birth.