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Candy Meiosis

Candy Meiosis. Objective: Use candy to make models of cell divisions of spermatogenesis & oogenesis. 1. Mitosis Somatic (body) cells Identical daughter cells created 1 division--> 2 diploid cells. 2. Meiosis Gametes (sex cells)

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Candy Meiosis

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  1. Candy Meiosis Objective: Use candy to make models of cell divisions of spermatogenesis & oogenesis.

  2. 1. Mitosis Somatic (body) cells Identical daughter cells created 1 division--> 2 diploid cells 2. Meiosis Gametes (sex cells) New daughter cells are different from each other and the original 2 divisions--> 4 haploid cells Introduction- Cell division

  3. Introduction- Meiosis Meiosis I • Chromosomes replicate • Homologous chromosomes pair up • Crossing over can occur • Chromosome number is haploid at end but chromosomes are still duplicated (X-shaped) Meiosis II • Just like mitosis • Sister chromatids separate

  4. 1. Spermatogenesis Male gametes (pollen, sperm) 4 sperm produced Equal distribution of cytoplasm and organelles 2.Oogenesis Female gametes (ova, ovules) 1 ovum and 3 polar bodies produced egg gets virtually all the cytoplasm & organelles Introduction- Meiosis

  5. To Do and Notice • Pick up a tray. Do not eat the candy until you’ve completed the activity. • Use string to create a cell membrane and a nuclear envelope. • Use 2 colors of gummy worms to make chromosomes that are replicated and arranged in homologous pairs. Where should they go? • Spread the remaining candy around the cytoplasm. • Cut the nuclear envelope into 4 pieces and set aside. • Cut the cell membrane into 2 pieces and form 2 new circles.

  6. To Do and Notice 7. Each new cell gets a replicated chromosome. 8. Divide the candy appropriately between the 2 cells depending upon whether you are making eggs or sperm. 9. Cut the strings again to make 4 cell membranes. Where does the candy (organelles & cytoplasm) go? Separate sister chromatids- one per cell. 10. Use the 4 pieces of string from the original nuclear envelope to make 4 new ones, show me and get a stamp in your notebook. Draw yours and another team’s with the opposite gamete.

  7. To Do and Notice • OK, now you can eat the wrapped candy. • Clean up by throwing away string and extra candy pieces. Put scissors back on the trays and return them to the back of the room.

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