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Meiosis Terminology
Various facts/vocabulary for the upcoming meiosis quiz, and then the meiosis/mitosis test after that for Mrs. O'Donnell
22
Biology
11th Grade
04/03/2011

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Term
Meiosis
Definition
Process of "reduction devision" in which the number of chromosomes per cell is cut in half.
Term
Use of Meiosis for Gametes
Definition
To ensure genetic variety
Term
Gamete
Definition
Reproductive cell (Sperm/Ovum)
Term
Somatic Cell
Definition
all cells of the body other than the Gametes(mitosis reproductive cells)
Term
Gonads
Definition
Hold the Gametes(testicles/ovaries)
Term
Homologous
Definition

The matching maternal and paternal chromosomes that meet up during crossing over to form a tetrad. 

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Term
Tetrad
Definition

When the homologous chromosomes(the matching maternal and paternal chromosomes) meat at the center during the crossing over, they form a tetrad. I think. 

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Term
Haploid
Definition

N A Single Set of Chromosomes Contains one member per each homologous pair (Each Gamete is a Haploid 23 chromosomes in humans)

 

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Term
Diploid
Definition

2N Cell that has both sets of homologous chromosomes 2 sets of chromosomes and 2 sets of genes (46 chromosomes in humans)

 

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Term
Crossing-over
Definition
When pieces of the homologous chromosome exchange - resulting in new combinations of genes
Term
Meiosis Stages?
Definition

2 Meiosis stages (remember the S phase DNA replication)

 

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Term
Meiosis 1 start
Definition
1 diploid cell to start
Term
Prophase 1
Definition
Each chromosome seaks out corrisponding homologous chromosome to form Tetrad.
Matching up crossing-over = new combo of genes
Term
Metaphase 1
Definition
Tetrads line up along equator
Term
Anaphase 1
Definition
Chromosomes move towards poles
Term
Telophase 1
Definition
Separation of cells
Term
Meiosis 2
Definition
Starts with the 2 new diploid cells made by meiosis 1
No new DNA replication
Term
Prophase 2
Definition
Tetrads form
Term
Metaphase 2
Definition
Tetrads line up along the equator
Term
Anaphase 2
Definition
chromosomes move toward poles
Term
Telophase 2
Definition
Devision of cells - 4 new haploid cells
Term
End result of Meiosis
Definition
4 Gametes
- 4 sperm, each genetically different
- 1 egg and 3 non-reproductive polar-bodies
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