Complete the MasteringBiology Lab: What Can Fruit Flies Reveal About Inheritance? located in the MasteringBiology Interactive Media link.

Complete the "What Can Fruit Flies Reveal About Inheritance? Lab" worksheet by taking notes from the investigation and answering the questions associated with the investigation.

Click the Assignment Files tab to submit your assignment.


Process of Science


What Can Fruit Flies Reveal about Inheritance?


Lab Notebook


Chi-Square test for Case 1





Observed No. (o)


Expected No. (e)








Red eyes







Sepia eyes









c2 (to the nearest ten-thousandth)







1. Why is it important to remove the adults in the parental generation?


2. What generation will their offspring be?


3. Based on the data obtained, is the cross in Case 1 monohybrid or dihybrid? Explain.


4. Is the cross in Case 1 sex–linked or autosomal? Explain.


5.  Based on the data obtained, is the most likely mode of inheritance in Case 2 autosomal or sex–linked? Explain.


6. From the data presented, what is the genotype of the parental (before the F1 generation; not shown here) generation?


7. Determine the degrees of freedom. This is the number of categories (red eyes or sepia eyes) minus one. For the data in Case 1, what is the number of degrees of freedom?


8. Find the probability (p) value for 1 degree of freedom in the 0.05 row. Compare this with the chi–square value you calculated in your Lab Notebook. What can you say about the null hypothesis?

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