Mitosis Onion Root Tip - Kyrene School District...•Cytokinesis occurs-division of cytoplasm –Animal cell- membrane pinches –Plant cell- cell wall forms inside out plant cell

MitosisOnion Root Tip

Low power

Low power

medium power

medium power

Most of the cells look like this. Your assignment is to find cells that look different. Draw as many different looking cells as you can find!

Mitosis

Cell division occurs in a series of stages or phases.

Mitosis

Replication and division of the nucleus

It insures that each of the cells has a complete set of DNA

“chromosomes”

Interphase(cell is doing its normal function)

• Nucleus and nucleolus visible

• chromatin (chromosomes NOT visible)

• Nuclear membrane intact

• DNA replicates

animal cell

plant cell

plant cell

interphase Prophase metaphase anaphase Telophase

Prophase

• Nuclear membrane and nucleolus dissolve

• Chromatin condensing into visible chromosomes

• In animal cells centrioles move to opposite poles

centrioles

plant cell

Metaphase

• Spindles line up chromosomes in center of cell

• Asters appear in animal cells

plant cell

Anaphase

• Centromeres separate

• Chromosomes are pulled toward poles by spindles

plant cell

Telophase

• Chromosomes uncoil into chromatin

• Nuclear membranes reform

• Nucleolus reappear

• Centrioles replicate

• Cytokinesis occurs-division of cytoplasm

– Animal cell- membrane pinches

– Plant cell- cell wall forms inside out

plant cell

Daughter Cell

• Two smaller cells are formed with the exact same chromosomes as the parent cell

• Cells are back in interphase

Daughter Cells

plant cell

whitefish

animal mitosis

Cells spend a small amount of time doing mitosis, the rest of the cell cycle is spent in interphase.

Cell cycle