Sunday, February 10, 2008

Mitosis and Meiosis

More new terms! Gamete, Diploid Cells, Haploid Cells, Gonads, Testes, Ovaries, Sperm Cells, and Egg Cells!

What is Mitosis? It is the process when one cell makes an exact copy of itself (clone), it does this by copying its chromosomes before dividing into two identical daughter cells. In humans and other multicellular organisms, mitosis is used to create new cells for repair of the body (example - new skin cells for healing.. new bone cells etc.)

What is Meiosis? It is the process when one cell creates 4 haploid cells (sex cells) that are all genetically different. The sex cells contain half the number of chromosomes of every other cell in the body. The sex cells created by the male testes is called the sperm cell. The sex cells created by the female ovaries is call the egg cell. In sexually reproducing organisms, an egg cell will be fertilized (united) with a sperm cell to create a zygote containing the full number of chromosome (46 for a human cell)


Important places to look.... Act 57 Copycat, Meiosis and Mitosis flash file, Meiosis and Mitosis powerpoint diagram.

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