Mitosis!
A form of asexual Reproduction Mitosis A form of asexual Reproduction Mitosis is the process in which the nucleus divides to form two new nuclei #1 and # 2 (Click on Mitosis above for video) 2
How do little elephants grow up to be BIG elephants?
Why do animals shed their skin?
#3 Three reasons why cells reproduce by asexual reproduction: 1. Growth 2. Repair 3. Replacement Skin cancer - the abnormal growth of skin cells - most often develops on skin exposed to the sun. Cells that reproduce by asexual reproduction reproduce constantly.
#4 & #5 and #6 Genetic material (DNA)is found inside of the cell - nucleus Every human body cell has 46 chromosomes (23 from mom, 23 from dad). DNA is copied during interphase (before mitosis starts) The 4 Steps of mitosis are: Prophase Metaphase Anaphase Telophase
The process of asexual reproduction begins after a sperm fertilizes an egg.
Plant and Animal Cells #7 Plant cells have chloroplast (for photosynthesis)-they also have cell walls Plant cells also have large vacuoles to store water Animal cells have no chloroplast or cell wall-contains small vacuoles if any
Plant and Animal Cell
What living things use mitosis? #8 Both plants and animals use mitosis Some unicellular organisms use mitosis to reproduce
Temporary Cell Structures in Mitosis #9 Centrioles, spindle fibers, centromeres are all temporary structures in the cell used for mitosis
Sister Chromatids #10 Chromosome
Centrioles #11 Centrioles move to the opposite ends of the cell and attach to chromosomes by spindle fibers
Animated Mitosis Cycle http://www.cellsalive.com/mitosis.htm Cell Division occurs in a series of stages, or phases Interphase (Not a phase of mitosis) Prophase (step1) Metaphase (step 2) Anaphase (step 3) Telophase & Cytokinesis (step 4)
Interphase # 12 occurs before mitosis begins Chromosomes are copied (# doubles) Chromosomes appear as threadlike coils (chromatin) at the start, but each chromosome and its copy(sister chromosome) change to sister chromatids at end of this phase CELL MEMBRANE Nucleus Cytoplasm Centromere-holds together the sister chromatids
Interphase Plant Cell Animal Cell Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm
Prophase 1st step in Mitosis Mitosis begins (cell begins to divide) Centrioles (or poles) appear and begin to move to opposite end of the cell. Spindle fibers form between the poles. Centrioles Sister chromatids Spindle fibers
Prophase (draw this) Plant Cell Animal Cell Spindle fibers Centrioles Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm
Metaphase 2nd step in Mitosis Chromatids (or pairs of chromosomes) attach to the spindle fibers. Draw this Centrioles Spindle fibers
Metaphase Plant Cell Animal Cell Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm
Anaphase 3rd step in Mitosis Chromatids (or pairs of chromosomes) separate and begin to move to opposite ends of the cell. Draw this but vertically Centrioles Spindle fibers
Anaphase Plant Cell Animal Cell Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm
Telophase 4th step in Mitosis Two new nuclei form. Chromosomes appear as chromatin (threads rather than rods). Mitosis ends. Nuclei Nuclei Chromatin
Telophase (draw this) Plant Cell Animal Cell Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm
Cytokinesis occurs after mitosis Cell membrane moves inward to create two daughter cells – each with its own nucleus with identical chromosomes.
Onion
Plant Mitosis -- Review Interphase Prophase Metaphase Anaphase Telophase
Phase?
Animal Mitosis -- Review Interphase Prophase Metaphase Anaphase Telophase
Cell Cycle
Mitosis Animation http://www.cellsalive.com/mitosis.htm