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Transcript
Asexual Reproduction Mitosis • Mitosis is the process in which the nucleus divides to form two new nuclei. 1 1 How do little elephants grow up to be BIG elephants? The process of asexual reproduction begins after a sperm fertilizes an egg. Cell that reproduce by asexual reproduction reproduce constantly. Animated Mitosis Cycle http://www.cellsalive.com/mitosis.htm • Interphase • Prophase • Metaphase • Anaphase • Telophase & Cytokinesis 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 • Nucleus CELL MEMBRANE Cytoplasm • • • Mitosis begins (cell begins to divide) Centrioles (or poles) appear and begin to move to opposite ends of the cell. Spindle fibers form between the poles. Centrioles Sister chromatids Spindle fibers • Chromatids (or pairs of chromosomes) attach to the spindle fibers. Centrioles Spindle fibers • Chromatids (or pairs of chromosomes) separate and begin to move to opposite ends of the cell. Centrioles Spindle fibers • • • Two new nuclei form. Chromosomes appear as chromatin (threads rather than rods). Mitosis ends. Nuclei Chromatin Nuclei • Cell membrane moves inward to create two daughter cells – each with its own nucleus with identical chromosomes. Interphase Prophase Metaphase Anaphase Telophase Cytokinesis IPMATC I Play More Atari Than Chess