HW-VOCAB QUIZ TOMORROW

1. TAKE OUT NOTES

Cell Division Biology

Cell cycle-process from start to finish

Cell division/cell cycle-Interphase through Cytokinesis

Mitosis (M phase) Prophase through Telophase Only divides the nucleus NOT the whole cell

Where does the cell cycle/division occur?All somatic (body) cellsCreates cells that are genetically the same

Identical DNA

interphase

Interphase-most common and longest

G1-cell growth and developmentcell doing the cell’s job

S-DNA synthesischromatin is copied to make two strands, one for each new cell

G2-more cell growth and developmentG0-cell exits the cell cycle and rests

Nervous cells are in G0

prophase

prophase

Chromatin thickens to become chromosomes (now visible)

Centrioles (plant cells do not have these) move to the poles of the cell

Chromosomes attach to the newly formed spindle fibers

Nucleus dissolves

metaphase

Metaphase (m for middle of the cell)Chromosomes line up along equator of cell

anaphase

Anaphase (a for apart-chromosomes move apart)

Sister chromatids split they are pulled centromere first

Start to reach the opposite poles

telophase

telophase

Chromosomes elongate and become chromatin again

Nucleus reformsSpindle fibers break down

CytokinesisCytokinesis happens-division of the cytoplasm and organelles using a cleavage furrow

Each new cell begins interphase and starts the cycle all over again.

Plant vs Animal CytokinesisPlants

Form a cell plate in the middle to divide the cell in half

The cell plate will eventually become the cell wall.

Animal CellThe cell membrane

and cytoplasm pinch or cleave in the middle until 2 cells are formed

DO NOT NEED A CELL PLATE

Microscope Lab

Look at the data table on page 249. Answer the questions.• 1. Most wbcs are needed for only a short

time to fight infection so they don’t have to live for a long time.

• 2. Cardiac muscle cells and neurons cannot divide, injuries to the heart and spinal cord cannot heal. The cells of smooth muscles can divide and heal through cell division.

• 3. The cells lining the digestive system are more prone to be destroyed.

• 4. Cancer cells are long lived and division can occur a seemingly unlimited number of times.