The Cell & Inheritance
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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