CB2a-Mitosis

• What happens in interphase?

  Chromosomes become visible and DNA has been copied
• What happens in prophase?

  Membrane around the nucleus disappears and chromatids pairs up
• What happens in metaphase?

  Chromosomes line up in the middle of the cell and attach to spindle fibres
• What happens in anaphase?

  Chromosomes are pulled to either side of the cell and are lined up on spindle fibres. Each side gets half of the chromosome.
• What happens in telophase?

  Spindle fibres disappear and a new membrane forms round each group of chromosomes
• What happens in cytokinesis?

  The cell splits into 2 separate daughter cells
• Why is mitosis important for an organism?

  repair, asexual reproduction and growth
• What does repair do in an organism (mitosis)

  It replaces dead/damaged cells
• What does asexual reproduction do in an organism (mitosis)

  Produces genetically identical offspring without a mate
• What does growth do in an organism (mitosis)

  produces new cells
• Describe how cancers grow

  Body cells divide uncontrollably and form a tumor. These cells can invade nearby tissues and spread to other parts of the body through the blood and lymphatic system.
• Exam question: Body cells have 2 sets of chromosomes. Explain how this happens

  One set of chromosomes is from the mother, and the other set is from the father
• Exam question: How are the daughter cells genetically identical?

  Each chromosome is copied, one copy of each chromosome goes into each daughter cell
• Exam question: A cell divided by mitosis. Describe the daughter cell in 2 bullet points

  - They are genetically identical to the parent cell

  -They have the same amount of chromosomes as the parent cell
• Name all stages of mitosis


  interphase, prophase, metaphase, anaphase, telophase, cytokinesis
• Explain 2 reasons why some organisms may rely on asexual reproduction

  - It's faster

  -only involves one organism
• What is one advantage of asexual reproduction?

  It is faster as there is no need to search for mates
• What is one disadvantage of asexual reproduction?

  No variation, so one disease may affect all of them
• Is mitosis haploid or diploid?

  diploid
• How many cells does mitosis make?

  2 identical cells
• Where does mitosis occur?

  Body cells except from gametes