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Starfish and Cell Division

Starfish and Cell Division. Sam Rymdeika Mary McDonald. Asterias forbesi. Animal. Cannot make their own food Digest their food Move place to place Have multiple cells eukaryotic. Echinoderms. Have arms, spines Center of body holds organs. Reproduction. External

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Starfish and Cell Division

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  1. Starfish and Cell Division Sam Rymdeika Mary McDonald Asteriasforbesi

  2. Animal • Cannot make their own food • Digest their food • Move place to place • Have multiple cells • eukaryotic

  3. Echinoderms • Have arms, spines • Center of body holds organs

  4. Reproduction • External • Eggs and sperm are released • Develop into bipinnarialarve • Other Ways of Reproduction • Arms fall off

  5. Sacrifice arms when under attack • Grows back • Mitosis is used to make another leg or arm • Regeneration

  6. Mitosis • Prophase • Prometaphase • Metaphase • Anaphase • Telophase

  7. Cell Reproduction • Why do cells reproduce? • Replace old cells • To produce organs and tissue • Develop into larger organisms and increase surface area • Five steps in the reproduction of cells • Interphase • Prophase • Metaphase • Anaphase • Telophase

  8. Cell Reproduction • Interphase • Phase before mitosis • The cells grow and make new materials in this phase • Prophase • First stage of mitosis • Chromatins tightly coil forming an X-shape • Each chromosome is doubled • The nuclear membrane is dissolved • Spindle fiber begins to form Cell during Interphase Cell during Prophase

  9. Cell Reproduction • Metaphase • Second phase of mitosis • Spindle fiber threads attach to the chromosome • The chromosomes move to the center of the cell • Anaphase • The chromosomes begin to separate • Called daughter chromosomes when separated • The shift in the plasma membrane is clear • Telophase • Chromsomes move back to chromatin • Spindle fiber dissolves • The membrane returns to original shape Cell during Metaphase Cell during Anaphase Cell during Telophase

  10. Work Cited • Khalid, N. (n.d.). Cellualr Biology. Retrieved from Oracle Think Quest website: http://ghr.nlm.nih.gov/handbook/howgeneswork/cellsdivide • national Institutes of Health. (2013, March 18). How do cells divide. Retrieved from Genetics Home Reference website: http://library.thinkquest.org/12413/reproduction.html • www.orma.com/sea-life/starfish-facts/ • www.cellsalive.com/mitosis.htm

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