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Cell Division in Starfish

Cell Division in Starfish. Caroline Mulligan and Shannon Keel. 2. Starfish. Kingdom: Animalia Characteristics of the Animalia (Animal) Kingdom: Multicellular Cells do not have cell walls Capable of responding to stimuli and moving Usually reproduce sexually

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Cell Division in Starfish

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  1. Cell Division in Starfish Caroline Mulligan and Shannon Keel 2

  2. Starfish • Kingdom: Animalia Characteristics of the Animalia (Animal) Kingdom: • Multicellular • Cells do not have cell walls • Capable of responding to stimuli and moving • Usually reproduce sexually • Heterotrophs (Obtain energy from food) 5

  3. Structures in an animal cell • Nucleus • Spindle Fibers • Centrioles

  4. Starfish- Asterias forbesi • Genus- Asterias • Species- Forbesi • Also known as the Forbes’ Sea Star or the common sea star • Found in the North American Atlantic Coast • They are usually tan, brown, or olive colored with tints of orange, pink, or red 4 5-picture

  5. Starfish • Other species • Asterias amurensis- • Asterias rubens 3

  6. Type of cellular division • Mitosis • Definition- when a single cell divides and makes two identical daughter cells • Both of the daughter cells will have the same number of chromosomes as the parent cell Phases of Mitosis • Prophase • Metaphase • Anaphase • Telophase (Cytokenisis) • Interphase 4 & 8

  7. Prophase • Centrioles start moving to opposite parts of the cell • The first stage of mitosis • Chromosomes condense and become visible • The nuclear membrane breaks down • Spindle apparatus forms at opposite poles of the cell 6, 7

  8. Metaphase • The nuclear membrane disappears • Spindle fibers align chromosomes on the center of the cell nucleus • This line is called the metaphase plate 6

  9. Anaphase • The spindle fibers shrink • The centromere breaks • Sister chromatids split and move to opposite sides of the cell 6

  10. Telophase • The chromosomes reach their cell poles • The nuclear envelope forms • The chromosomes unravel • The spindle fibers break down Cytokinesis • The cell membrane splits • Two identical cells are made 6

  11. Interphase • Phase between cell division • Consists of G1, G0, S Phase, and G2 1

  12. Significance • Understanding Mitosis • Helps to explain how mutations occur • Semi- conservative replication

  13. Works Cited • Lye, B. (2003). Cell division and mitosis. Retrieved from http://biology.kenyon.edu/HHMI/Biol113/mitosis.htm. • Carrington, E., Zabel, E., & D' Arezzo, A. (1998). Field guide to the shores of Rhode Island. Retrieved from http://www.uri.edu/cels/bio/rishores/rocky.htm. • Age Fotostock. (2013). Forbes starfish asterias forbesi adult, in shallow water on beach of broken shells. Retrieved from http://www.agefotostock.com/en/ Stock-Images/Rights-Managed/FHR-34727-00001-207. • Nature Education. (2013). Mitosis. Retrieved from http://www.nature.com/scitable/ topicpage/mitosis-14046258. • Herreid, C. (1999). Starfish. Retrieved from http://wwwbio200.nsm.buffalo.edu/ labs/tutor/Starfish.

  14. Works Cited • Estrada, J. (2013). Cell cycle sequencing. Retrieved from http://joshattualatinhigh4a.edublogs.org/2012/01/03/cell-cycle- sequencing/. • Pearson Education. (n.d.). Prophase. Retrieved from http://www.phschool.com/ science/biologyplace/labbench/lab3/prophase.html. • University of Arizona. (1997). The cell cycle and mitosis tutorial. Retrieved from http://www.biology.arizona.edu/cell_bio/tutorials/cell_cycle/ cells3.html.

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