Mitosis

  • Submitted by: hollier1999
  • Views: 1311
  • Category: Science
  • Date Submitted: 07/09/2010 07:02 PM
  • Pages: 2

Mitosis

Post a 200- to 300-word response explaining why the process of mitosis and meiosis are both important to a living organism. When would an organism need to undergo the process of mitosis and meiosis? What would happen if meiosis did not occur?

Cells are always dying, so new cells need to replace them somehow. Mitosis is the dividing and formation of new cells from current already existent cells. Some cells such as the cells in your hair follicle on your head divide very fast (which is why radiation therapy in cancer causes you to lose hair since it targets rapidly dividing cells). Meiosis involves the production of gametes, also known as egg and sperm. If meiosis didn't happen, organisms couldn't reproduce, and if mitosis didn't occur, organisms would die because cells undergo cellular respiration in order for us to even breathe!
Mitosis is the process of the chromosomes dividing.
Steps of mitosis:
  * prophase- chromosomes coil up and become visible
  * metaphase- the chromosomes move toward the center
  * anaphase- the chromatids are pulled apart
  * telophase- a nuclear envelope forms around the chromosomes

It is very essential that cells go through mitosis, so that each new cell contains the same genetic information.
Meiosis is a form of cell division that halves the number of chromosomes in the gametes. Meiosis is pretty much the same as mitosis it’s just that is goes through the process twice. Males end up with 4 sperm which is spermatogenesis. Females end up with 4 eggs but the other 3 die due to being too small and lacking cytoplasm which is oogenesis. It is also very essential that meiosis occurs, because reproduction would cease.
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