background notes mitosis and meiosis
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Mitosis and Meiosis notesTRANSCRIPT
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Background InformationMitosis and Meiosis
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Mitosis
A type of asexual reproductionMitosis is a type of cell division where two
new daughter cells are formed with identical DNA.
There are 6 stages to mitosis.
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Interphase
Chromosomes are copied (# doubles)
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Prophase
The cell begins to divide.
Centrioles (or poles) appear and begin to move to opposite ends of cell
Nuclear membrane dissolves.
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Metaphase
Chromosome pairs line up in the middle of the cell.
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Anaphase
“Tug-of-War” stageChromatids (or pairs of
chromosomes) separate and begin to move to opposite ends of the cell.
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Telophase
Two new nuclei formCell membrane
begins to pinch!
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Cytokenesis
The division of the cytoplasm!
During cytokenesis the cytoplasm is split evenly between the two new cells.
Animal cell and Plant cells differ during this part of telophase….why?What structure does a plant cell have, that an animal cell doesn’t?
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What is the difference between animal cell and plant cell mitosis?Plant cells have a rigid cell wall,
animal cells do NOT!Because of the cell wall, plant
cells are NOT able to “pinch”…instead a cell plate forms between the two new daughter cells.
This cell plate will become the new cell wall that separates the two daughter cells!
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Meiosis
A type of asexual reproduction that produces egg and sperm cells that are needed for sexual reproduction!
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Compare Mitosis and Meiosis
THE DNA IS COPIED BEFORE THE NUCLEUS DIVIDES in both mitosis AND Meiosis!
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Contrast Mitosis and Meiosis
MitosisUsed for GROWTH AND
REPAIR.
ONE nuclear division
Produces 2 IDENTICAL DAUGHTER CELLS
DNA is copied ONCE, NUCLEUS DIVIDES ONCE.
MeiosisUsed only for making
EGG AND SPERM CELLS.
TWO nuclear divisions
Produces 4 DIFFERENT DAUGHTER CELLS
DNA is copied ONCE, but NUCLEUS DIVIDES TWICE!