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IV. All living things grow A. We went from a zygote to an individual containing billions of cells by a process called cell division B. Why do cells divide? 1. ______________________________________ 2. ______________________________________ C. How do cells divide? 1. Interphase a. chromosomes _________________________ b. cell prepares for division c. Cells spend most of their time in interphase 2. Mitosis a. occurs in the ____________ cells b. steps: (1) ________________ (a) chromosomes ______________ and become visible; 1st time seen with a microscope (b) _______________________ disappears (c) _______________________ form (2) ____________________ (a) chromosomes ___________________ ______________________________ (b) spindle fibers attach to the chromosomes at the ______________________ (3) ___________________ (a) double stranded chromosomes separate and are pulled by the spindle fibers to ____________________________________ (4) __________________________ (a) ______________________ disappear (b) new _________________ forms around each new set of chromosomes (c) two new identical cells are formed called ___________ cells each having the _______ number of chromosomes as the original cell (parent cell) animal cell – _____________ pinches inward dividing the cell into two plant cell________________forms down the middle dividing the cell into two 2. Meiosis a. cell division, which occurs in the sex cells b. 4 new cells are produced – Checking Understanding: Compare mitosis and meiosis below: Mitosis Occur in what cells? Number of divisions How many cells are formed? Compare the number of chromosomes formed in the new cells to the original cell Meiosis Below draw a picture of what an animal and a plant cell would each look like during cytokinesis: Animal Plant Does cell division occur in a unicellular organism? Explain. A mistake in what phase would result in a cell having an extra chromosome or a cell missing a chromosome? Explain why you chose that phase. What type of asexual reproduction is most similar to cell division? Explain how the two are similar and how they are different.