Mitosis and the Cell Cycle

Division of the nucleus and the nuclear material (DNA), as well as the cell.

The Cell Cycle/ Cell life-span

Interphase

Mitosis

Cytokinesis

Interphase

G1: Growth of cell

S: Replication of DNA (46 chromosomes -> 92 chromosomes)

G2: Preparation for mitosis (replicate other organelles)

MITOSIS: the nucleus divides

Prophase

Metaphase

Anaphase

Telophase

Prophase

DNA (chromatin) condenses (coils) into chromosomes.

Nuclear envelope/nuclear membrane disappears

Centrioles move to opposite ends of the cell

Metaphase

Chromosomes line up on the equatorial plate (middle of the cell)

Mitotic spindle forms Centrioles and microtubules

Metaphase

Chromosomes line up on the equatorial plate (middle of the cell)

Mitotic spindle forms Centrioles and microtubules

Anaphase

Chromosomes are pulled apart at the centromere by the microtubules attached to the centrioles in the mitotic spindle.

Anaphase

Chromosomes are pulled apart at the centromere by the microtubules attached to the centrioles in the mitotic spindle.

Telophase

Chromosomes are at opposite ends of the cell

Two nuclear envelopes reform around each 46 set of chromosomes

Chromosomes uncoil and the DNA is now called chromatin

Cytokinesis

Division of the cytoplasm.

TWO new IDENTICAL cells are formed.

Cytokinesis in an Animal Cell

Cleavage Furrow

Cytokinesis in a Plant Cell

Cell Plate