MITOSIS

ONE CELL “PARENT”

TWO NEW IDENTICAL CELLS

“DAUGHTER CELLS”

INTERPHASE• G1 Phase = Growth of Cell• S Phase = DNA Replicates• G2 Phase = Cell Grows Again DNA is in

CHROMATIN form!

DNA = Chromatin

DNA

ONE DNA Molecule

TWO DNA Molecules =

Replicated DNA

CELL DIVISION•MITOSIS–DNA & Nucleus divides

•CYTOKINESIS–Cytoplasm divides

MITOSIS• DNA & Nucleus divides

• PROPHASE• METAPHASE• ANAPHASE• TELOPHASE

Chromatin Chromosomes

PROPHASE

• Replicated DNA - Chromatin thickens and is now known as Chromosomes.

• Chromosomes become visible (able to see)

• The nuclear membrane disappears

• Spindle fibers form

METPHASE

• The chromosomes line up in the middle of the cell.

• Chromosomes are attached to the spindle fibers.

• “M”etphase = “m”iddle

Replicated DNA = CHROMOSOMES

Centrioles

ANAPHASE

• Spindle fibers pull the chromosomes apart and drag them to opposite sides of the cell.

• Sister chromatids apart• The replicated DNA

molecules are now split.

Replicated DNA = PULLED APART

Sister

Chromatids

TELOPHASE

• Chromosomes uncoil back to CHROMATIN.

• Nuclear membranes reform in both sides.

• Spindle fibers disappear.

DNA BACK TO = CHROMATIN

Chromatin Chromatin

Nuclear Membrane

Nuclear Membrane

CYTOKINESIS

Cytoplasm divides = actual cells split into two new identical cells!

CYTOKINESIS – ANIMAL CELL

• In animal cells,A Cleavage Furrow develops and splits the two new cells apart. Chromatin Chromatin

Cleavage Furrow

CYTOKINESIS – PLANT CELL

• In plant cells,A CELL PLATE develops and splits the two new cells apart.

DNA BACK TO = CHROMATIN

NOW YOU TRY…

INTERPHASEClick on the picture below that shows INTERPHASE?

INTERPHASEWhat happens in INTERPHASE? Click on correct step.

Cell grows and DNA replicates

Chromosomes visible, spindle fibers form, nuclear membrane disappears.

Chromosomes line up in the middle of the cell.

Chromosomes are pulled apart by the spindle fibers and sister chromatids

move to opposite ends.

Chromosomes uncoil back to chromatin, spindle fibers disappear,

two new nuclear membranes appear.

CORRECT!

INTERPHASE

Cell grows and DNA replicates

PROPHASEClick on the picture below that shows PROPHASE?

PROPHASEWhat happens in PROPHASE? Click on correct step.

Cell grows and DNA replicates

Chromosomes visible, spindle fibers form, nuclear membrane disappears.

Chromosomes line up in the middle of the cell.

Chromosomes are pulled apart by the spindle fibers and sister chromatids

move to opposite ends.

Chromosomes uncoil back to chromatin, spindle fibers disappear,

two new nuclear membranes appear.

CORRECT!

INTERPHASE PROPHASE

Cell grows and DNA replicates

Chromosomes visible, spindle fibers form, nuclear membrane disappears.

METAPHASEClick on the picture below that shows METAPHASE?

METAPHASEWhat happens in METAPHASE? Click on correct step.

Cell grows and DNA replicates

Chromosomes visible, spindle fibers form, nuclear membrane disappears.

Chromosomes line up in the middle of the cell.

Chromosomes are pulled apart by the spindle fibers and sister chromatids

move to opposite ends.

Chromosomes uncoil back to chromatin, spindle fibers disappear,

two new nuclear membranes appear.

CORRECT!

INTERPHASE PROPHASE METAPHASE

Cell grows and DNA replicates

Chromosomes visible, spindle

fibers form, nuclear

membrane disappears.

Chromosomes line up in

the middle of the cell.

ANAPHASEClick on the picture below that shows ANAPHASE?

ANAPHASEWhat happens in ANAPHASE? Click on correct step.

Cell grows and DNA replicates

Chromosomes visible, spindle fibers form, nuclear membrane disappears.

Chromosomes line up in the middle of the cell.

Chromosomes are pulled apart by the spindle fibers and sister chromatids

move to opposite ends.

Chromosomes uncoil back to chromatin, spindle fibers disappear,

two new nuclear membranes appear.

CORRECT!

INTERPHASE PROPHASE METAPHASE ANAPHASE

Cell grows and DNA replicates

Chromosomes visible, spindle

fibers form, nuclear

membrane disappears.

Chromosomes line up in

the middle of the cell.

Chromosomes are pulled apart by

the spindle fibers and sister

chromatids move to opposite ends.

TELOPHASEClick on the picture below that shows TELOPHASE?

TELOPHASEWhat happens in TELOPHASE? Click on correct step.

Cell grows and DNA replicates

Chromosomes visible, spindle fibers form, nuclear membrane disappears.

Chromosomes line up in the middle of the cell.

Chromosomes are pulled apart by the spindle fibers and sister chromatids

move to opposite ends.

Chromosomes uncoil back to chromatin, spindle fibers disappear,

two new nuclear membranes appear.

CORRECT!

INTERPHASE PROPHASE METAPHASE ANAPHASE TELOPHASE

Chromosomes uncoil back to

chromatin, spindle fibers

disappear, two new nuclear membranes

appear.

Cell grows and DNA replicates

Chromosomes visible, spindle

fibers form, nuclear

membrane disappears.

Chromosomes line up in

the middle of the cell.

Chromosomes are pulled apart by

the spindle fibers and sister

chromatids move to opposite ends.

CHROMATIN OR CHROMOSOME?

INTERPHASE PROPHASE METAPHASE ANAPHASE TELOPHASE

CHROMATIN

CHROMATIN

CHROMOSOME

CHROMOSOME CHROMOSOME

CHROMOSOME

CHROMATIN