Name____________________________________ Date________________ Hour________________

GENETICS COMPUTER SIMULATIONS – VARIATIONS TO DOMINANCE

GENETICS CD - 5

Directions: Obtain a CD entitled "Biology Explorer 3.04 Genetics" and a coin from your instructor. Go quietly to the Media Center computer lab. Insert the CD and then complete the following activity. Return the CD to your instructor when finished.

PURPOSE: To discover alternate inheritance patterns that vary from simple dominance!

PROCEDURE:

    1. Go to the START MENU.
    2. Place your cursor on PROGRAMS.
    3. Move your cursor to "LOGAL Biology Teacher."
    4. Click on GENETICS MAIN MENU.
    5. Click on "CORE INQUIRIES."
    6. Click on "VARIATIONS TO DOMINANCE."
    7. <<At this point, the arrows to move around through the program are at the very bottom of the screen. We may have to grab and drag the Start menu tool bar downward until we can’t see it any longer in order to uncover the arrows we need.>>
    8. Follow the directions on each page to complete the exercise. Blue "hyperlinked" words in the directions text can be clicked on to perform certain functions.

QUESTIONS AND DATA TABLES:

  1. Describe their phenotypes for wing color. Male phenotype______________________ Female phenotype______________________
  2. What phenotypes might you expect to find in the F1 offspring of this cross? Make a prediction.

    3.  

  3. Record the results.

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  4. Do the F1 results match your prediction? __________________________
  5. What do you think might explain these results?

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  6. According to this hypothesis, what phenotypes(s) would you expect in the F2 generation?

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  7. Record the resulting phenotypes and their ratio in the F2 generation.

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  8. How do these results compare with those predicted by the "mixing" hypothesis on page 5?

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  9. THE PUNNETT SQUARE

    10. P X P CROSS

    b

    b

    B

    B

     

     

     

     

    (9 cont.) F1 X F1 CROSS

  10. How might the observed phenotypic ratio in the F2 offspring be consistent with this Punnett square?

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  11. Describe this pattern of inheritance, in your own words.

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  12. Describe their phenotypes for abdomen color.

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  13. Predict the phenotypes in the F1 generation.

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  14. Record the results.

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  15. How is this phenotype different, in principle, from the F1 phenotype in the previous butterfly example?

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  16. Predict the phenotypic ratio of the offspring of an F1 X F1 cross.

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  17. Record the phenotypes and their ratio in the F2 offspring.

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  18. How doe the results compare with your prediction from the previous page.

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  19. Describe this pattern of inheritance in your own words.

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  20. Summarize the similarities and differences between the two variations to dominance which you just investigated.