Meiosis

=Meiosis= Alex Kingsley

Meiosis 1
Interphase 1 - Cells undergo a round of DNA replicaition, forming duplicate chromosomes. Prophase 1 - Each chromosome pairs with its corresponding homologous chromosome to form a tetrad. Metaphase 1 - Spindle fibers attach to the chromosomes. Anaphase 1 - The fibers pull the homologous chromosomes toward opposite ends of the cell. Telophase 1 and Cytokinesis - Nuclear membranes form. The cell separates into two cells.

Meiosis 2
Prophase 2 - Meiosis 1 results in two haploid daughter cells, each with half the number of chromosomes as the original cell. Metaphase 2 - The chromosomes line up in a simular way to the metaphase stage of mitosis. Anaphase 2 - The sister chromatids separate and move toward opposite ends of the cell. Telophase 2 and Cytokinesis - Meiosis 2 results in four haploid daqughter cells.



Meiosis is the same as mitosis except mitosis only goes through the 1st steps. it dosnt repeat them. Nondisjunction is error in meiosis in which homologous chromosomes fail to separate.

Karyotypes are photographs of chromosomes grouped in order in pairs. Genetic recombination is the process by which a molecule of nucleic acid is broken and then joined to a different one.

Animation:[[image:http://www.answersingenesis.org/home/area/magazines/tj/images/v17n1_demographics.jpg width="180" height="368"]]
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