MitosisClick on the hyperlink above to watch a tutorial of

the cell cycle

Critical Check Points in the Cell Cycle

Chromosome Duplication Kinetochore

The Phases

Interphase

TelophaseAnaphase

Metaphase

Prometaphase

Prophase

Cytokinesis

Mitosis Tutorial

Click on the hyperlink above- Watch the narration of mitosis- Complete the step through version of mitosis- Complete the quiz after the tutorial

Interphase• period of cell growth and metabolic activity• DNA is duplicated, but exists as chromatin• organelles have been replicated• G1, S, and G2 subphases

Prophase• chromatin condenses and forms chromosomes• mitotic spindle (microtubules) forms from

centrosomes• centrosomes contain centrioles in animal cells

Interphase

Prophase

Prometaphase

• nuclear envelope breaks down• spindle fibers attach to chromosomes at a

structure called a kinetochore- protein structure that assembles the

centromere• spindle fibers begin to move chromosomes

Metaphase

• chromosomes have been aligned in the middle of the cell (metaphase plate)

• centromeres are lined up Metaphase

Anaphase

• sister chromatids of each chromosome are separated

• spindle fibers pull the sister chromatids apart• some spindle fibers act to elongate the cell

Anaphase

Telophase• cell elongation continues• nuclear envelopes reform around each set of

chromosomes• chromosomes uncoil• mitotic spindle disappears

Cytokinesis• division of the cytoplasm• two genetically identical daughter cells are

formed• resulting daughter cells are diploid

Animal and Plant Cell Mitosis

Animal Cell• have centrosomes and

centrioles which generate the mitotic spindle

• cell membrane pinches inward during cytokinesis dividing the two cells (cleavage furrow)

Animal and Plant Cell Mitosis

• only have centrosomes

• cell plate forms during cytokinesis

• vesicles carrying cell membrane and wall components are transported to the midline

- vesicles fuse forming the new cell membrane and

wall

Plant Cell

Cell Plate Formation