At which stage are the chromosomes first visible?

Happy with this? Try the BIOLOGY PROJECT tutorial from the University of Arizona

You need to remember the

Remember that mitosis is a continuous process. Watch the animation below to remind you of the what happens in the different stages.

In mitosis the rates of cell division vary. Most bacterial cells divide every 15-20 minutes and most mammalian cells every 12-40 hours.

Interphase has three phases G1, S and G2. DNA replication takes place during the S phase and the mitochondria and chloroplasts replicate during the G2 phase. The mitochondria and chloroplasts have their own DNA.