producing new cells

• mitosis stage 1:

  In the original parent cell, the each chromosome makes an identical copy of itself. Forming 2 identical chromatids joined in the centre by a centromere.

  
• mitosis stage 3: spindle fibres pull the chromatids apart to the poles of the cell

  
• mitosis stage 2: chromosomes line up at the equator of the cell

  
• mitosis stage 4: nuclear membranes forms around each set of chromosomes

  
• mitosis stage 5: cytoplasm divides to form 2 separate diploid cells

  
• Mitosis maintains the diploid chromosome complement of the new cells, providing the body with new cells that can be used in growth and repair.
• A stem cell in an animal is an unspecialised cell that can divide to produce more stem cells or become specialised. They have the potential to become any cell type in the body.
• • Embryonic stem cells are taken from an embryo at a very early stage, they can become any cell in the body.
• tissue stem cells are found in a wide range of tissues such as bone marrow and are restricted to become any type of cell in the tissue or organ they reside in.
• Cells → Tissues → Organs → Organ systems → Organisms
• A diploid cell had two matching sets of chromosomes.
• haploid cells have one set of chromosomes, gametes are always haploid cells