Mitosis Review. The Cell Cycle (2 parts) G1 S G2 Mitosis telophase anaphase metaphase prophase interphase 1 2.

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Presentation transcript:

Mitosis Review

The Cell Cycle (2 parts) G1 S G2 Mitosis telophase anaphase metaphase prophase interphase 1 2

Maintaining Chromosome Number chromosomes (unduplicated) in parent cell at interphase same chromosomes (duplicated) in interphase prior to mitosis mitosis, cytoplasmic division chromosome (unduplicated) in daughter cell at interphase chromosome (unduplicated) in daughter cell at interphase

Stages of Mitosis Prophase Metaphase Anaphase Telophase

Prophase New microtubules are assembled One centriole pair is moved toward opposite pole of spindle Chromatin condenses into chromosomes Nuclear envelope starts to break up

Transition to Metaphase Spindle forms Spindle microtubules become attached to the two sister chromatids of each chromosome

Metaphase All chromosomes are lined up at the spindle equator Chromosomes are maximally condensed

Anaphase Sister chromatids of each chromosome are pulled apart Once separated, each chromatid is a chromosome

Telophase Chromosomes decondense Two nuclear membranes form, one around each set of unduplicated chromosomes

Results of Mitosis Two daughter nuclei Each with same chromosome number as parent cell Chromosomes are in unduplicated form

Cytoplasmic Division Usually occurs between late anaphase and end of telophase Two mechanisms –Cell plate formation (plants) –Cleavage furrow (animals)

Animal Cell Division: Cleavage Furrow

Plant Cell Division: Cell Plate Formation cell wall former spindle equator cell plate vesicles converging

Let’s see real plant cells During Mitosis

Onion root tip mitosis - Interphase stage. Credit: © Carolina Biological/Visuals Unlimited

Onion root tip mitosis - Prophase stage. Credit: © Carolina Biological/Visuals Unlimited

Onion root tip mitosis - Metaphase stage. Credit: © Carolina Biological/Visuals Unlimited

Onion root tip mitosis - Early anaphase stage. Credit: © Carolina Biological/Visuals Unlimited

Onion root tip mitosis - Late anaphase stage. Credit: © Carolina Biological/Visuals Unlimited

Onion root tip mitosis - Telophase stage. Credit: © Carolina Biological/Visuals Unlimited

Onion root tip mitosis - Daughter cells. Credit: © Carolina Biological/Visuals Unlimited

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