NAME___________________________ DATE___________________ HOUR___________________

BIOLOGY I -

TO BE COMPLETED AFTER CD’S 4 AND 5 BUT BEFORE CD 6

HEREDITY - 4

INTRODUCTION – So far, we have been dealing with one trait at a time… A dihybrid cross follows two traits at once. So we might be dealing with rabbit ears and their coat color at the same time. This causes for some changes in the phenotypes we can expect.

QUESTIONS ABOUT CD 4 –

    1. What is a test cross?

      2.  

    2. Perform a test cross Punnett square on a straight eared rabbit:

 

 

 

 

 

 

QUESTIONS ABOUT CD 5 -

    1. What is the difference between incomplete dominance and codominance?

      2.  

       

       

       

    2. Which simulation on our CD’s was an example of incomplete dominance? Butterflies or Flies?

      3.  

       

    3. Which simulation on our CD’s was an example of codominance? Butterflies or Flies?

 

 

 

 

QUESTIONS ABOUT CD 6 –

    1. What does it mean to say that two genes are linked?

      2.  

       

    2. What is a dihybrid cross?

      3.  

       

    3. What are the four possible phenotypes from this cross? BbTt X BbTt?

      4.  

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    4. What would be the genotype of the individual that I would cross with a BbTt critter in order to do a test cross?