b2

• what is cell division?

  cell division is the process by which a cell divides to produce two identical daughter cells
• what is mitosis?

  mitosis is when during the cell cycle the genetic material is doubles. It then divides into two identical nuclei
• cell cycle

  body cells divide in a series of stages called the cell cycle
• in what is mitosis cell divison important?

  mitotic cell division is important in the growth, repair, and development of muticellular organism
• how are two identical cells formed?

  before a cell can divide it needs to grow, replicate the DNA to form 2 copies of each chromosome and increase the number of subcellular structure. in mitosis 1 set of chromosomes is pulled to each end of the cell and the nucleus divides. finally the cytoplam and cell membranes divide to form 2 identical cells
• where does mitosis take place in plant cells?

  in plant cells, mitosis takes place throughout life in the meristems found in the shoot and root tips
• when do animal cell differentiate?

  early stage of development
• what is a stem cell?

  stem cells are unspecialised cells that can become any typ of cell needed
• what is differentiation?

  cell differentiation is a process by which the cell changes to beocme specialised
• what treatment can stem cells hep with?

  paralysis and diabetes
• how are zygotes formed?


  an egg an sperm cell fused together
• what are embryonic stem cells?

  cygote divides and becomes a hollow ball of cells (embryo), the inner cells of this ball are the embryonic stem cells
• what are stem cells from plant meristems used for?

  to product new plant clones quickly and economically for research, horticulture, and agriculture
• what happens in therapeutic cloning?

  an embryo is produced with the same genes as the patient so the stem cells produced are not rejected and may be used for medical treatment
• whats bad about the use of stem cells?

  some potential risks and some people have ethical and religious objections. they believe tat life begins at conception, which means that the embryo is alive
• how does mitosis work?

  1)cell grows and increase in number of sub cellular structures

  2)DNA replicates to form two copies of each chromosome

  3)one set of chromosomes is pulled to each other and of the cell and the nucleus divides.

  4)the cytoplasm and cell wall membrane divide to form two identical cells