23 terms

Mitosis Meiosis Class (for Final Dec2015)

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Terms in this set (...)

Somatic Cell
Body cells
Gamete
Haploid reproductive cells
Chromatid
Half of a chromosome
Crossing Over
The exchange of DNA between chromosomes during meiosis.
Haploid
1 set of chromosomes or 1N
Diploid
2 sets of chromosomes or 2N
Mitosis
Reproduction of somatic cells
Meiosis
Production of gametes
Interphase
Cell grows, performs its normal functions, and prepares for division; consists of G1, S, and G2 phases
Prophase
In the first stage of mitosis, chromatin condenses into chromosomes
Metaphase
In the second stage of mitosis, chromosomes line up in the middle of the cell
Anaphase
In the third stage of mitosis, chromatids separate and move to opposite sides of the cell
Telophase
In the last stage of mitosis, two new nuclei begin to form
Cytokinesis
Once mitosis is complete, the cell pinches into two new daughter cells
Prophase I
The chromosomes condense, and the nuclear envelope breaks down. crossing-over occurs.
Metaphase I
The second phase of meiosis I. The paired homologous chromsomes (tetrads) align at the center of the cell (the metaphase plate).
Anaphase I
The third phase of meiosis II. The sister chromatids are spearated at their centromeres and pulled to opposite sides of the cell. The number of chromosomes was reduced by half during meiosis I.
Telophase I
4th phase of meiosis- two cells(Genetically different from parent cell)
Prophase II
The first phase of meiosis II. Prophase II is identical to mitotic prophase, except that the number of chromosomes was reduced by half during meiosis I.
Metaphase II
2nd phase of meiosis II. Metaphase II is identical to mitotic metaphase, except that the number of chromosomes was reduced by half during meiosis I.
Anaphase II
The third phase of meiosis II. The sister chromatids are spearated at their centromeres and pulled to opposite sides of the cell. The number of chromosomes was reduced by half during meiosis I.
Telophase II
A nuclear envelope forms around each set of chromosomes and cytokinesis occurs, producing four daughter cells, each with a haploid set of chromosomes. Genetically UNIQUE
Homologous Chromosomes
a matching pair of chromosomes, one inherited from mom and one inherited from dad