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*MITOSIS*
STANDARD HS-LS1-7: USE A MODEL TO ILLUSTRATE THE ROLE OF CELLULAR
DIVISION (MITOSIS) AND DIFFERENTIATION IN PRODUCING AND MAINTAINING
COMPLEX ORGANISMS.
EMILY WIECZOREK
Watch this video for an introduction of mitosis..
VOCAB WORDS
• CHROMATIN- RELAXED FORM OF DNA
• CHROMOSOMES- TIGHTLY
WOUND BUNDLES OF
• SISTER CHROMATIDS- THE TWO
DNA
HALVES OF A DUPLICATED CHROMOSOME
• SPINDLE FIBERS- DIVIDE CHROMOSOMES
• PARENT CELL- THE ORIGINAL CELL THAT IS DUPLICATED
• DAUGHTER CELLS- THE RESULT
OF CELL DIVISION: TWO IDENTICAL CELLS
STAGES OF THE CELL CYCLE
1. INTERPHASE
• G1
• S
• G2
2. MITOSIS
• PROPHASE
• METAPHASE
• ANAPHASE
• TELOPHASE
3. CYTOKINESIS
INTERPHASE
• CHROMOSOMES ARE RELAXED IN CHROMATIN
• NUCLEAR ENVELOPE
STILL INTACT
• CENTRIOLES APPEAR
• S PHASE- DNA IS COPIED (SYNTHESIS)
• G PHASES- CELL GROWS
AND PREPARES FOR DIVISION
PROPHASE
•
CHROMATIN CONDENSES INTO CHROMOSOMES
• NUCLEAR ENVELOP
STARTS TO DISSOLVE
• CENTRIOLES MIGRATE TO THE POLES
METAPHASE
• CHROMOSOMES MOVE TO THE CENTER
THE CELL PULLED BY SPINDLE FIBERS
OF
ANAPHASE
• CHROMOSOMES PULLED TO OPPOSITE
POLES OF THE CELL BY SPINDLE FIBERS
• SISTER CHROMATIDS ARE SEPERATED
TELOPHASE
• CHROMOSOMES ARRIVE AT THE POLES
• NUCLEAR ENVELOPES
REFORM
• CYTOPLASM STARTS TO DIVIDE
CYTOKINESIS
• CELL ACTUALLY
SPLITS FORMING TWO
DAUGHTER CELLS
• CHROMOSOMES UNWIND
INTO CHROMATIN