Presentation on theme: "Mitosis. Why do cells divide? The larger a cell gets, the more demands it places on its DNA."— Presentation transcript:
Why do cells divide?
The larger a cell gets, the more demands it places on its DNA
As a cell gets larger, it has more trouble moving enough nutrients (food) and waste across its cell membrane
Before a cell gets too large it divides. Cell division is the process by which a cell divides into two new daughter cells
Cell division occurs in a series of stages or phases…..
Interphase Using Latin P&S, Interphase means – Between phase Chromosomes are copied (number doubles) At the beginning of this phase chromosomes appear threadlike and are known as chromatin, but by the end of this phase chromosomes have taken a new shape
Prophase MITOSIS BEGINS Using Latin P&S, Prophase means – Before phase Cell begins to divide Centrioles appear and begin to move to opposite ends of the cell Spindle fibers form between the centrioles Nuclear membrane begins to break down
Metaphase Chromatids attach to spindle fibers Chromatids are lined up in the MIDDLE
Anaphase Chromatids separate and begin to move to opposite ends of the cell
Telophase Using Latin P&S, Telophase means – End phase Two new nuclei form Chromosomes once again appear as chromatin (threads rather than rods) MITOSIS ENDS
Cytokinesis Cell membrane moves inward to create two daughter cells – each with their own nucleus and identical chromosomes