Cell Division Cell division allows organism to grow , repair damaged structures, and reproduce. 10.5 What are the functions of cell division? What happens during the cell cycle?

Reproduce Repair Damaged Cells Grow Cell Division allows organisms to . . . . . Repair Damaged Cells Grow

What happens During the Cell Cycle? During the cell cycle, a cell grows, prepares for division, and divides into two new cells, which are called “daughter cells”. Cell Division Stage 1: Interphase The cell grows, Chromosomes are copied and appear as threadlike coils, called Chromatin, at the start, but each chromosome and its copy (Sister chromosome) change to sister chromatids at the end of Interphase.

Centrioles Pairs Centrioles Structures that help an animal cell divide into two new cells. The centrioles are duplicated.

Chromosomes Threadlike structures made of DNA and protein within the nucleus are called chromosomes. At the end of replication, the cell contains two identical sets of chromosomes.

Stage 2:Mitosislong version (15:00) Mitoisis consists of 4 phases: Remember “PMAT” Prophase * Metaphase * Anaphase * Telophase Short version – 1:18

Prophase Mitosis begins Chromosomes in the nucleus condense. The pairs of centrioles appear and move to opposite ends of the cell. Spindle fibers form between the poles

Metaphase Chromatids (or pair of chromosome) attach to the spindle fibers at its centromere. What is missing from the cell??? Nucleus What happened to the chromosomes? They moved to the center of the cell.

Anaphase Chromatids separate and begin to move to opposite ends of the cell Each chromatid is now a single, unreplicated chromosome. These chromosomes are drawn by their spindle fibers to opposite ends of the cell.

The last phase of mitosis Telephase The last phase of mitosis Two new nuclei form The chromosomes appear as chromatin. The nuclear envelope forms around the the 2 separate nuclei. Cell is pinching in around its middle

Stage 3: Cytokinesis As cytokinesis continues, cell member continues to create daughter cells- each with its own nucleus with identical chromosomes