#32 Summary of Cell and Nuclear division

1. Growth of a multicellular organism is a result of parent cells dividing to produce genetically identical daughter cells.

2. During cell division the nucleus divides first, followed by division of the whole cell.

#31 Control of cell division, Stem cell, Haploid and Diploid cells

Each cell contains genes that help to control when it divides.

Cells divide by mitosis only when required.
When receives signals from neighbouring cells, it responds by dividing or not dividing.

If this control goes wrong, cells may not divide when they should (growth does not take place, or wounds do not heal) or they may divide when they should not (a tumour may form).

# 30 Mitosis

Mitosis is a nuclear division giving rise to genetically identical cells in which the chromosome number is maintained by the exact duplication of chromosome.

# 29 DNA structure

In the nucleus of each cell, the DNA molecule is packaged into thread-like structures called chromosomes. Each chromosome is made up of DNA tightly coiled many times around proteins called histones that support its structure.

# 28.2 The mitotic cell cycle - Syllabus 2016 - 2018

5.1 Replication and division of nuclei and cells 
    5.2 Chromosome behaviour in mitosis

# 28.1 The mitotic cell cycle - Syllabus 2015

• Replication and division of nuclei and cells
• Understanding of chromosome behaviour in mitosis