What is the difference between mitosis and meiosis? library. thinkquest. org
Vocabulary § Mitosis: The phase in the cell cycle during which the nucleus divides § Meiosis: A part of sexual reproduction in which cells divide to form sperm cells in a male and egg cells in a female. Meiosis occurs only in reproductive cells.
Vocabulary § DNA: deoxyribonucleic acid, a chemical that contains information for an organism’s growth and functions § Chromosomes: the physical structure in a cell that contains the cell’s DNA (genetic material) § Cell cycle: the normal sequence of development and division of a cell § Genome: All the DNA of an organism, including its genes; the genetic material of an organism.
Mitosis and Meiosis § Create two cells from one cell! § there has to be enough stuff for both cells to be able to live § so, there has to be duplication of a lot of stuff before the first cell (parent) divides.
Mitosis and Meiosis § One of the things to duplicate is the genome. § These are the chromosomes which are made up of DNA. § Once the DNA replicates (makes 2 copies of everything from what the parent originally had), the cell can divide.
Differences of Mitosis and Meiosis § MITOSIS § the 2 cells that come out of the division (daughters) are EXACTLY the same in genetic makeup as the original mother cell. § They have the very same DNA and therefore make the same proteins and therefore the cells behave the same.
Differences of Mitosis and Meiosis § MEIOSIS § Purpose of meiosis is to make new types of cells! (the cells are not the same at all) § Eggs and sperm are products of meiosis § Genetic diversity happens from mixing of genes inside the cells of the mother and father § Why do you have traits given to you from your grandmother through your father, even though your father may not have that trait ? (he carries it in his genes for later mixing)