Mitosis Cell Reproduction

HOW DOES AN ORGANISM GROW?

HOW DOES AN ORGANISM GET BIGGER?

Mitosis Notes Asexual Reproduction – offspring are produced that are genetically identical to the parent Mitosis – the asexual reproduction process of cell division

Interphase What happens? Chromosomes are present but not visible DNA replicates How the cell normally looks

INTERPHASE When the cell performs its function (example: muscle cells contract and expand during interphase to help you move) Cell gets bigger (makes more cytoplasm and organelles) Cell copies DNA

Part of mitosis? Interphase is part of the cell’s life cycle; but it is NOT a stage of mitosis

Prophase What happens? Nuclear membrane disappears Chromosomes appear Centrioles begin to move

PROPHASE DNA (which was loose in nucleus) gets tightly wound into chromosomes Nucleus dissolves

Metaphase What happens? Spindle fibers line the chromosomes up in the middle of the cell

METAPHASE Chromosomes line up in the center of the cell Spindle fibers attach to each chromosome

Anaphase What happens? The spindle fibers pull the chromosomes apart at the middle

ANAPHASE Chromosomes are pulled to opposite ends of the cell

Telophase What happens? Nuclear membrane reappears Chromosomes disappear The cell begins to be pinched in the middle

TELOPHASE A new nucleus forms around each set of chromosomes. This produces one cell with two nuclei

Cytokinesis What happens? The cell is pinched in half Two identical cells are made

CYTOKINESIS A new cell membrane (and cell wall in plants) is created between the two new cells. TWO IDENTICAL CELLS ARE FORMED

The Phases of Mitosis Interphase 1. Prophase 2. Metaphase 3. Anaphase 4. Telophase 5. Cytokinesis Mnemonic Device P lease M eet A t T he C ircus

Mitosis Notes During cell division …  It is essential that the DNA is replicated  The number of chromosomes NEVER changes  Each daughter cell gets its own copy of the DNA

Using the textbook define the following terms Mitosis Cytokinesis Centromeres Interphase Cell cycle Spindle