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Introduction: Sexual reproduction involves meiosis. Eggs and sperm will unit to form a new being. In order to maintain the number of chromosomes the eggs and sperm must start with half of the original quantity (ie: somatic human cells have 46 chromosomes and sex cells have 23 chromosomes). In this activity you will compare the process of meiosis to mitosis. Materials: mitosis colorgram meiosis colorgram poster board 2 – 25 cm yarn segments (1 of each color) glue colored pencils. Procedure: 1. Split your poster board into 2 segments and label one mitosis and one meiosis. 2. Begin your diagram of the cell using colored pencils and yarn (chromosomes). 3. Each starting cell for both meiosis and mitosis should have 2 pairs of chromosomes. 4. Each stage must have a complete written description below each cell. 5. On the back, complete a double bubble map comparing meiosis and mitosis. 6. Answer the questions in the Analysis section. Analysis: 1. What is the total number of chromosomes present in the parent cell before mitosis? _______ 2. How many of each color are present before mitosis? __________ 3. How many daughter cells result from mitosis? ___________ 4. Is there any difference between the parent cell and the daughter cells in mitosis? ______________________________________________________________________ 5. What is the total number of chromosomes present in the parent cell before meiosis? ______ 6. How many of each color are present before meiosis? __________ 7. How many daughter cells result from meiosis? ____________ 8. List all differences between the parent cell and the daughter cells in meiosis? ______________________________________________________________________ 9. How many pairs of chromosomes are in each human body (somatic) cell? ___________ 10. How many pairs of chromosomes are in each human egg or sperm? (Be careful.) ___________ 11. Complete the following table. Cell Type Number of Chromosomes in Cell Process used to make cell (Mitosis or Meiosis) Stomach Liver Sperm Heart Egg 12. Complete the following table by checking the process of the cell division in which each step occurs. Mitosis Two new cells are formed from each original Four new cells are formed from each original Replication of chromosomes occurs Doubled chromosomes pair to form tetrads Cells with a reduced chromosome number are formed Cells with the same chromosome numbers as original are formed Results in forming egg or sperm cells Results in forming somatic or body cells Each original cell divides only once Each original cell divides twice Tetrads are not formed Chromosomes move to the cell’s center Meiosis