How do baby animals grow to be adults?

Why do animals shed their skin?

Cells divide for three purposes: Organisms grow because cell division increases the total number of cells. Each day, cells in your body wear out or become damaged and need to be replaced. Asexual reproduction

The Cell Cycle - Mitosis A cell grows, prepares for division, and then divides into two new cells. These two new cells, called daughter cells, are identical to the parent cell because they have the same DNA as the parent cell.

3 stages of the Cell Cycle: Interphase Mitosis –P–Prophase –M–Metaphase –A–Anaphase –T–Telophase Cytokinesis

Interphase Cell spends most of its life in this phase The cell grows to its full size DNA is copied in the nucleus of the cell Cell prepares to divide

Interphase

Prophase 1 st and longest phase of Mitosis Chromosomes become visible Centrioles separate and move to opposite ends of cell Spindle fibers appear Nuclear membrane disappears

Prophase

Metaphase 2 nd and shortest phase of Mitosis Chromosomes attach to spindle fibers in center of cell

Metaphase

Anaphase 3 rd phase of Mitosis Centromeres split apart and chromatids separate from each other. Chromosomes move to opposite poles

Anaphase

Telophase 4 th and last phase of Mitosis Chromosomes reach opposite poles of cell Chromatids unwind back into chromatin Nuclear membranes begins to form around the chromatin at each end Spindle fibers disappear

Telophase

Cytokinesis New cell membrane forms between two nuclei. The cell splits into two new cells – each with identical chromosomes.

Cytokinesis

Interphase Prophase Metaphase Anaphase TelophaseCytokinesis Mitosis Review

REMEMBER! I Interphase P Prophase M Metaphase A Anaphase T Telophase C Cytokinesis IPMATC

Video Clips Click box to view movie.