Marshall: Quiz Tomorrow

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Vocabulary Quiz next week

 

THE STAGES of the CELL CYCLE:

1.  Interphase: thecell grows, copies DNA and prepares for division.

2.  Mitosis: whenthe cell’s nucleus (middle) and nuclear material divide

3.  Cytokinesis: whenthe cell’s cytoplasm divides, creating a new cell

THE CELL CYCLE:

1. Interphase: the cell grows,carries out cellular functions, and replicates.

Interphase Stages:

1.  G1: thecell is growing, carrying out normal cell jobs & preparing to copy DNA

2.  S: thecell copies its DNA getting ready for cell division

3.  G2: thecell prepares for the division of its nucleus

2. Mitosis: whenthe cell’s nucleus (middle) and nuclear material divide

       

  4Mitosis Stages:

1st)            PROPHASE:

1.  The cell’s chromatin tightens

2.  Sister chromatids are attached at the centromere

3.  Spindle fibers form in the cytoplasm

4.  Thenuclear envelope seems to disappear

5.  Spindle fibers attach to the sister chromatids

2nd)           METAPHASE:

1.  Sister chromatids are pulled along the spindleapparatus toward the center of the cell

2.  They line up in the middle of the cell

3rd)           ANAPHASE:

1.  The microtubules of the spindle apparatus beginto shorten

2.  The sister chromatids separate

3.  The chromosomes move toward the poles of the cell

4th)           TELOPHASE:

1.  The chromosomes arrive at the poles and begin torelax

2.  Two nuclear membranes begin to form and thenucleoli reappear

3.  The spindle apparatus disassembles

3. Cytokinesis: when the cell’scytoplasm divides, creating a new cell

·     In animal cells, microfilaments constrict(tighten), or pinch the cytoplasm

·     In plant cells, a new structure, called acell plate, forms