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The Cell & Inheritance
 

The Cell & Inheritance

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    The Cell & Inheritance The Cell & Inheritance Presentation Transcript

    • The Cell & Inheritance Mr. Schumaier C & H 3.3
    • 1 What important piece of information did Walter Sutton add to scientists’ understanding of genetics?
    • Sutton predicted that chromosomes were key to understanding how offspring come to have traits similar to those of their parents
    • 2 How does the number of chromosomes in a grasshopper’s sex cells compare to the number in its body cells?
    • The sex cells have exactly half the number of chromosomes as the body cells. Body Cells – 24 Sex Cells - ?
    • 3 What role do chromosomes play in inheritance?
    • Genes are carried from parents to their offspring on chromosomes.
    •  
    • 4 What is MEIOSIS?
    • MEIOSIS is the process where the number of chromosomes is reduced by half.
    •  
    • 5 What type of cells form by meiosis?
    • Sex Cells Sperm & Eggs
    • 6 What events occur during meiosis?
      • MEIOSIS BEGINS– Chromosomes copied
      • MEIOSIS I – Chromosomes pair up and two cells form with ½ the number of chromosomes.
    • 3. MEIOSIS II – Double rods split and move to ends of the cell. 4. END OF MEIOSIS – Four sex cells have been produced with ½ the number of chromosomes.
    •  
    • 7 How is a Punnett square a model for what happens during meiosis?
    • XX It shows how the alleles separate to form all the possible sex cells. X Y X X XX XY XY
    • 8 How many chromosomes does a human body cell contain?
    • 46
    • 9 On what structures in a cell are genes located?
    • Genes are located on chromosomes.
    • 10 The body cells of hamsters have 44 chromosomes. How many chromosomes would the sex cells of a hamster have?
    • 22 chromosomes
    • The End