The Cell Cycle

InterphaseThe stage where a cell spends most of its life.Period of growth and development.This is where cells just “do what they do.”

Muscle and nerve cells are always in interphase.Why?

Interphase3 stages

G1- first stage of growth and energy production (ATP)S phase- DNA duplication or synthesis, uses ATP from

G1G2- second stage of cell growth and more energy

production (ATP)

MitosisThe process where a single cell divides

resulting in two identical cells, each containing the same number of chromosomes and genetic content as that of the original cell.

Takes place in somatic cells.All body cells except reproductive cells (sperm

and egg)

A Few Key Terms To Understand MitosisChromatids- two chromosomes attached

together by a centromere.This happens after the S-phase in interphase.

Centromere- button-like body that joins single chromosomes to form chromatids.

Centriole- cylindrical shaped organelle that provides the anchor for spindle fibers during mitosis

Spindle fibers- a network of filaments involved in moving and separating chromosomes during mitosis

ProphaseThe first stage of mitosis.Chromatin coil and condense forming a

chromosome.Centrioles develop and move to opposite ends

of the cell.Spindle fibers form.Nuclear membrane begins to break down.

Allows chromosomes to move throughout the center of the cell.

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Prophase Draw the prophase stagein the space provided.

Label- Centrioles,Spindle fibers, Chromatids, NuclearMembrane, Centromere

MetaphaseThe second stage of mitosis.The chromatids align at the exact center (equator)

of the cell.

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MetaphaseDraw the stage of metaphase

Label- Chromatids, Centriole, Spindle fibers,Centromere, Equator

AnaphaseThe third stage of mitosis.Centromeres split, and spindle fibers pull

chromatids apart making separate chromosomes.

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AnaphaseDraw the stage of anaphase

Label- Centriole, Spindlefiber, chromosomes

Telophase The fourth stage of mitosis.This stage is the opposite of prophase.Chromosomes uncoil to form a mass of

chromatin.A nuclear membrane forms around each mass

of chromatin.Spindle fibers breakdown and disappear. MITOSIS HAS ENDED!!!Welcome to Discovery Education Player

TelophaseDraw the stage of telophase.

Label- Chromatin,Nuclear membrane

CytokinesisThe splitting apart of the daughter cells.Animal cells- cleavage occurs and the cells

pinch apart.Plant cells- a cell plate forms and grows

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