Meiosis brief overview1 (1)

An Introduction to Meiosis
Review: Mitosis is cell reproduction to create new cells
Meiosis is the kind of cell reproduction that form eggs and sperm .
In meiosis the cell divides twice and is called Meiosis I and Meiosis II

Steps of Meiosis
Meiosis I
Phrophase I : Chromosomes gave already duplicated. The nuclear membrane disappears
Metaphase I : Chromosomes line up in pairs
Anaphase I : Chromosomes pairs separate
Telophase I : Cells pinch apart

Meiosis II
Phrophase I: Chromosomes do not duplicate, so there are only two sets of each chromosomes
Metaphase II: Chromosomes line up in the center of the cell

Anaphase II: Chromosomes split and separate
Telophase II : Cells pinch together. Nuclear membranes form.

Four daughter cells are formed.
Each cell has only half the number of chromosomes as the parent cell.
In human males, four sperm result from meiosis. In females, only one egg results.
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Egg and sperm join together during fertilization .
Each supply half the new cell’s chromosomes.
Then the new organism develops by mitosis

Meiosis brief overview1 (1)

by Judy Aguilar on Feb 12, 2012

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