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

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

Introduction- Cell divisionIntroduction- Cell division

1. Mitosis• Somatic (body)

cells• Identical

daughter cells created

• 1 division--> 2 diploid cells (46 chromosomes)

1. Mitosis• Somatic (body)

cells• Identical

daughter cells created

• 1 division--> 2 diploid cells (46 chromosomes)

2. Meiosis• Gametes (sex cells)

• New daughter cells are different from each other and the original

• 2 divisions--> 4 haploid cells (23 chromosomes)

2. Meiosis• Gametes (sex cells)

• New daughter cells are different from each other and the original

• 2 divisions--> 4 haploid cells (23 chromosomes)

Introduction- MeiosisMeiosis I• Chromosomes replicate

(briefly quadraploid)• 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

Introduction- MeiosisIntroduction- Meiosis1.

Spermatogenesis

• Male sex cells (pollen/sperm)

• 4 sperm produced• Equal

distribution of cytoplasm and organelles

1. Spermatogenesis

• Male sex cells (pollen/sperm)

• 4 sperm produced• Equal

distribution of cytoplasm and organelles

2. Oogenesis• Female sex cells (ova, ovules)

• 1 ovum and 3 polar bodies produced

• egg gets virtually all the cytoplasm & organelles

2. Oogenesis• Female sex cells (ova, ovules)

• 1 ovum and 3 polar bodies produced

• egg gets virtually all the cytoplasm & organelles

New input pageNew input page

Title: Candy Meiosis Divide into 4 panels Label panels “beginning”, “after meiosis 1”, “after meiosis 2 sperm”, “after meiosis 2 egg”

As you proceed following teacher directions, draw results in each panel.

Label chromosomes, organelles, diploid cell, haploid cell

OUTPUT page tonight: compare/contrast spermatogenesis & oogenesis via paragraph, venn diagram or concept map

Title: Candy Meiosis Divide into 4 panels Label panels “beginning”, “after meiosis 1”, “after meiosis 2 sperm”, “after meiosis 2 egg”

As you proceed following teacher directions, draw results in each panel.

Label chromosomes, organelles, diploid cell, haploid cell

OUTPUT page tonight: compare/contrast spermatogenesis & oogenesis via paragraph, venn diagram or concept map

To Do and NoticeTo Do and Notice1. Pick up a tray. Do not eat the candy until

you’ve completed the activity.2. Use string to create a cell membrane and a

nuclear envelope.3. Use 2 colors of gummy worm to make

chromosomes that are replicated and arranged in homologous pairs. Where should they go?

4. Spread the remaining candy around the cytoplasm.

5. Cut the nuclear envelope into 4 pieces and set aside.

6. Cut the cell membrane into 2 pieces and form 2 new circles. For oogenesis, uneven sizes, for spermatogenesis, equal sizes

1. Pick up a tray. Do not eat the candy until you’ve completed the activity.

2. Use string to create a cell membrane and a nuclear envelope.

3. Use 2 colors of gummy worm to make chromosomes that are replicated and arranged in homologous pairs. Where should they go?

4. Spread the remaining candy around the cytoplasm.

5. Cut the nuclear envelope into 4 pieces and set aside.

6. Cut the cell membrane into 2 pieces and form 2 new circles. For oogenesis, uneven sizes, for spermatogenesis, equal sizes

To Do and NoticeTo Do and Notice7. Each new cell gets a replicated chromosome (gummy worm X). What has happened to the amount of genetic material in each cell?

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) go? Separate sister chromatids- one per cell.

10. Show me the final product, after you use the pieces of the original nuclear envelope to make 4 new ones and get a stamp in your notebook.

7. Each new cell gets a replicated chromosome (gummy worm X). What has happened to the amount of genetic material in each cell?

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) go? Separate sister chromatids- one per cell.

10. Show me the final product, after you use the pieces of the original nuclear envelope to make 4 new ones and get a stamp in your notebook.

To Do and NoticeTo Do and Notice

OK, now you can eat the 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.

OK, now you can eat the 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.