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Meiosis vs. Mitosis

By | Feb. 2012
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Mitosis and Meiosis
What is Mitosis?
Mitosis produces two daughter cells that are identical to the parent cell. If the parent cell is haploid (N), then the daughter cells will be haploid. If the parent cell is diploid, the daughter cells will also be diploid. N  N

2N  2N
This type of cell division allows multicellular organisms to grow and repair damaged tissue. Click here to go to the chapter on Mitosis.
Summary of the Phases of Mitosis
The drawings below show chromosome movement and alignment in a cell from a species of animal that has a diploid number of 8. As you view the drawings, keep in mind that humans have a diploid number of 46.

Interphase
Chromosomes are not visible because they are uncoiled

Prophase
The chromosomes coil.
The nuclear membrane disintegrates.
Spindle fibers (microtubles) form.
The drawing shows a cell with 8 chromosomes. Each chromosome has 2 chromatids for a total of 16 chromatids.
Metaphase
The chromosomes become aligned.
The drawing shows a cell with 8 chromosomes. Each chromosome has 2 chromatids for a total of 16 chromatids.
Anaphase
The chromatids separate; the number of chromosomes doubles.
The drawing shows a cell with 16 chromosomes. Each chromosome has 1 chromatid for a total of 16 chromatids.
Telophase
The cell divides into two.
The chromosomes uncoil.
The nucleus reforms.
The spindle apparataus disassembles.
The drawing shows a cell with 16 chromosomes. Each chromosome has 1 chromatid for a total of 16 chromatids.
G1 Interphase
The chromosomes have one chromatid.
The drawing shows two cells. Each cell has 8 chromosomes. Each chromosome has 1 chromatid for a total of 8 chromatids per cell.
G2 Interphase
The chromosomes have two chromatids each.
The drawing shows two cells. Each cell has 8 chromosomes. Each chromosome has 2 chromatids for a total of 16 chromatids per cell.
What is Meiosis?
Meiosis produces daughter cells that have one half the number of...

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