Two types of nuclear division:
- Mitosis = two daughter nuclei, same number of chromosomes as parent cell.
- Meiosis = four daughter nuclei, half number of chromosomes as parent cell.
Mitosis = division of nucleus of cell resulting in daughter cells having exact copy of DNA of the parent cell.
Genetic make-up identical to parent nucleus (except in mutation).
Mitosis preceded by interphase = period where cell is not dividing.
Interphase contains all the cellular activity and includes the replication of DNA ready for mitosis - cell is actively sythesising proteins, chromosomes are invisible.
Mitosis can be divided into four stages:
1) Prophase = chromosomes become visible, nuclear envelope and nucleolus disappear.