Cell Division

• What is a gene?

  small section of DNA
• What are chromosomes?

  structures in nucleus that carry genes
• How many chromosomes in a human body cell?

  46
• Chromosomes are arranged in __ pairs

  23
• What is mitosis?

  Produces 2 genetically identical daughter cells
• What happens at the 1st stage of mitosis?

  cell grows and DNA replicates
• What happens at the 2nd stage of mitosis?

  One set of chromosome is pulled to each end of the cell
• What happens at the 3rd stage of mitosis?

  Cytoplasm and cell membrane divide
• What is Differentiation?

  when a cell becomes specialised to perform a function
• What is a stem cell?

  an undifferentiated cell that can become specialised
• What is a zygote?

  single new cell formed after fusion of gametes
• Where do you get stem cells in animals?

  bone marrow
• Where are stem cells in plants?

  meristem
• Benefits of cloning plants

  stops extinction of endangered plants, produces numbers of rare plants
• Concerns for using stem cells

  unethical to use aborted embryos, expensive