Jan 05, 2016
The Cell Cycle• Defined: Repeating set of events in the life of a cell• 1) Interphase
– G1, S, G2
• 2) Prophase• 3) Metaphase• 4) Anaphase• 5) Telophase
Remember: The cell won’t continue on to the next stage unless the cell is large enough and everything has been copied properly.
What is Mitosis?• Mitosis: Cell division
involving somatic (non-sex) cells
• Involves only diploid cells• Form of asexual
reproduction for some life (bacteria & protista, fungi)
• End Result: Two genetically identical “daughter cells”
Interphase• Divided into 3 Stages:• G1 Stage
– Normal function performed
– Cell growth– Organelles
duplicated/created• S Stage
– Chromatin (DNA strands) duplicated
• G2 Stage– Cell growth– Normal function
performed
Prophase• 1st Mitosis Stage• Chromatin (DNA
strands) coils into chromosomes
• Nucleus dissolves spilling the chromosomes
• Spindle fibers form
Metaphase• 2nd stage of mitosis• Spindle fibers
attach to centromeres of each chromosome
• Spindle fibers pull the chromosomes to the cell’s equator
Anaphase• 3rd stage of mitosis• Spindle fibers rip
apart the chromosomes– 1 chromatid pulled
to each direction
Telophase• 4th stage of mitosis• Spindle fibers
dissolve• Nucleus reforms• Chromatids unwind
into chromatin• Cytokinesis occurs
(splitting of cytoplasm)– NOT APART OF
TELOPHASE• End result: 2
identical diploid cells
?
Name that Stage!
Hint:
Chromosomes are aligned in middle of cell
Name that Stage!
Hint:
Cell plate is splitting the cell
Name that Stage!
Hint:
Two normal looking nuclei of two cells
Name that Stage!
Hint:
Chromosomes are forming and the nucleus is gone
Name that Stage!
Hint:
Chromatids are being pulled apart
Name this stage of the cell cycle.
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MitosisA Quick Overview
REVIEW
1) In order, name the 5 stages of the cell cycle.
2) Pick a stage of the cell cycle. Name two things that happen in this stage.
3) Review the picture slides. Identify the stages based on the picture.
4) The division of the cytoplasm is called _____.
5) Which cells divide by mitosis?
6) During which interphase stage is DNA created?
7) During which stage do spindle fibers form?
8) During which stage are chromosomes aligned in the middle?
9) During which stage are chromatids separated?
10) During which stage does the nucleus dissolve?