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Mitosis-Meiosis-Cell Cycle

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Morgan Speltz

on 20 December 2013

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Transcript of Mitosis-Meiosis-Cell Cycle

Mitosis-Meiosis-Cell Cycle
By: Morgan Speltz


-Makes 2 cells
-results in new genetically identical cells (2n-2n)
-4 phases (prophase, metaphase,
anaphase, and telophase)
-Body cells are created
-The number are chromosomes stays the same
*We need Mitosis because it makes new cells and will take the place of the dead ones, so we can survive.


-Second phase of mitosis
- Chromosomes line up in the middle of
the cell
-Chromosomes are held together by spindle fibers.

-Third phase of mitosis
- Chromosomes separate and move toward opposite poles
- Once separated, they are now considered individual chromosomes

-First phase of mitosis
-Condensation of chromosomes
-Nuclear membrane and nucleolus disappear.

The Cell Cycle
G1 Phase
S Phase
G2 Phase
M Phase
G0 Phase
-Offspring cells grow to mature size
-Stands for the time following cell division
Prophase I & II
Metaphase I & II
Anaphase I & II
Telophase & Cytokinesis I & II
-Last phase of mitosis.
- Spindle fibers disassemble.
-Nuclear membrane forms around chromosomes.
-Nucleolus forms in new cells.
-Same phases as mitosis
-2 stages: I and II
-4 cells are created
-Diploid to haploid (2n-n)
-Number of chromosomes are reduced by half
-Produces gametes
-Meiosis II is not followed by copying of DNA
*We need Meiosis because without it, new lives can't be made.
-Synapsis occurs (pairing of homologous chromosomes)
-DNA coils tightly into chromosomes
-Spindle fibers form

-Chromosomes line up in the middle of the cell
- Spindle fibers from opposite poles attach to the the other homologous chromosomes

- The homologous chromosomes separate and move to opposite poles (independent assortment)
- Independent assortment results in the separation of maternal and paternal which results in genetic variation

- Chromosomes are now at opposite ends of the cell
-Nuclear membrane forms around chromosomes
-Cytokinesis begins
- Cytokinesis I forms 2 new cells while cytokinesis II forms 4 new cells

-All of the events that happen in cell division
-Includes interphase, mitosis, and cytokynesis
-Cells can leave the cycle and go to the G0 phase
*The cell cycle is important because it's the life of a cell. Without cells we wouldn't be living. They are the basic unit of life
-Follows G1 phase
-The DNA in the cell is copied

-Follows G2 phase
-The cell prepares for cell division
-Also known at mitosis
-Part of cell division
-Division of the nucleus occurs in the cell

-Occurs when cells exit the cell cycle
-Cells do not copy DNA or prepare for cell division
-Cells are done growing
Ex. Nerve cells. Once they are damaged, they can't come back
-The time between cell divisions
-Three phases: G1 phases, S phase, and G2 phase
-Happens during telophase
-The division of cytoplasm into 2 cells
-Cleavage furrow is the pinching of where the cell divides
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