Mitosis and Meiosis. The Cell Cycle DNA: contains the information that tells a cell how to make proteins. Chromosomes: coiled structure of DNA and protein.

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Presentation transcript:

Mitosis and Meiosis

The Cell Cycle DNA: contains the information that tells a cell how to make proteins. Chromosomes: coiled structure of DNA and protein that forms in the cell nucleus during cell division.

Prokaryotic Cells Binary Fission: the simple cell division in which one cell splits into two; used by bacteria.

Homologous chromosomes: chromosomes with matching information. Chromotids: identical copies of a chromosome. Centromere: The region that holds chromotids together when a chromosome is duplicated.

MITOSIS Nuclear division in a eukaryotic cell in which each cell receives a copy of the original chromosomes.

Remember……. There are 3 STAGES in this process Interphase Mitosis Cytokinesis

Four phases of Mitosis Prophase Metaphase Anaphase Telophase

Interphase The time in between cell division

Interphase THE CELL GROWS TO ITS MATURE SIZE THE CELL MAKES A COPY OF ITS DNA CHROMATIN-(threadlike form of dna) IT PREPARES TO DIVIDE

Prophase (phase 1) Nuclear membrane breaks apart Chromosomes become rodlike. Centrioles move to opposite sides of cell. Fibers form between two pairs of centrioles

Metaphase (phase 2) Chromosomes line up along equator (middle) of the cell. Spindle fibers attach through the centromere

Anaphase (phase 3) Chromotids separate and are pulled to opposite side of cell by the fibers attached to centrioles

Telophase (phase 4) Nuclear membrane forms around two sets of chromosomes. Fibers disappear

Cytokinesis Cytoplasm splits in two. Result: two identical cell

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