1. Melissa Gustray, Mickey Gill, Justin Girone
Mitosis
Melissa Gustray, Mickey Gill, Justin Girone

2. Mitosis & Meiosis
Mitosis is a form of cell division that occurs in somatic (non-sex) cells and produces two daughter cells from an original cell
New cells are genetically identical
46 chromosomes
Meiosis is a second form of cell division that occurs only in the cells that give rise to sex cells (sperm and eggs)
Halves chromosome number
Does this so that when the sperm fertilizes the egg, the 46 chromosomes are restored

4. Interphase First step in cell division.
Cells replicate genetic information and all organelles.
Divided into phases:
S Phase- synthesis
Cellular components duplicate
G Phase- gap or growth
G1 and G2- specific molecules and structures duplicate (everything but DNA) & cellular growth occurs

5. Mitosis Karyokinesis- “nucleus movement”, nuclear contents divide
Cytokinesis- “cell movement”, cytoplasm is equally divided between the two new daughter cells
Continuous cycle broken down into four stages:
Prophase
Metaphase
Anaphase
Telophase

6. Prophase First stage of mitosis Chromatin condenses into chromosomes
Centrioles move to opposite sides of cytoplasm
Nuclear membrane and nucleolus disperse
Microtubules assemble and associate with centrioles and chromatids of chromosomes

7. Metaphase Second stage of mitosis
Spindle fibers from the centrioles attach to the centromeres of each chromosome
Chromomsomes align midway between the centrioles

8. Anaphase Third stage of mitosis
Centromeres separate, and chromatids of the chromosomes separate
Spindle fibers shorten and pull these new individual chromosomes toward centrioles

9. Telophase Final stage of mitosis
Chromosomes elongate and form chromatin threads
Nuclear membranes form around each chromosome set
Nucleoli form and microtubules break down

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