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Genetics-Chapter 5 - 5A-2
Genetics - The Continuity of Life Part I - 5A-2
19
Biology
9th Grade
11/17/2010

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Term
cell cycle
Definition
The repeating cycle of events in the life of a cell. 3 phases - interphase, mitosis, and cytokinesis.
Term
interphase
Definition
A period of time between cell divisions.
Term
mother cell
Definition
Any cell that is ready to begin cell division.
Term
mitosis
Definition
The duplicating and separating of a cell's chromosomes.
Term
prophase
Definition
1st phase of mitosis - changes occur in the nucleus & cytoplasm.
Term
kinetochore
Definition
Special proteins located at the centromere where spindle fibers attach.
Term
mitotic spindle
Definition
Special microtubules that will "direct" the movements of the chromosomes during mitosis.
Term
kinetochore fiber
Definition
Mitotic spindle fiber that attaches to the kinetochore of the centromere - begins to position them for the next phase
Term
polar fiber
Definition
Mitotic spindle fibers that extended out from 1 centrosome to the middle of the cell & join polar fibers from the opposite centrosome.
Term
metaphase
Definition
2nd phase of mitosis. Stage when the centromeres are aligned on the equatorial plane.
Term
equatorial plane
Definition
An imaginary line bisecting the spindle.
Term
anaphase
Definition
Phase of mitosis - enzymes break down the proteins in the centromeres, allowing the 2 chromatids to separate.
Term
telophase
Definition
Phase of mitosis - new nucleus begins to re-form around the chromosomes forming 2 daughter nuclei.
Term
cytokinesis
Definition
The division of the cytoplasm in a dividing cell.
Term
cell plate
Definition
The precursor to the cell wall during cytokinesis in plant cells.
Term
daughter cell
Definition
The 2 cells that result from a mitotic division.
Term
binary fission
Definition
A method of asexual reproduction in which the nuclear material is copied and the parent cell divides into 2 equal cells.
Term
asexual reporduction
Definition
Producing a new organism without the fusion of a sperm and an ovum.
Term
spore
Definition
A cell with a hard protective covering that is capable of producing a new organism.
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