Drosophila Crosses

Directions:
  1. Anesthetize your flies and dump out all flies.
  2. Just examine the adults and separate males and females.
  3. Count the number of males that have red and white eyes and record.
  4. Do the same for females
    5.
     

    Males

    Female

    Total Number

    		    

    White eyes

    		    

    Red Eyes

    		    

    Brown Eyes (sepia)

    		    

    No wing

    		    

     

  5. Find the Percentage of males that have white eyes by taking your total number of male flies that have white eyes and dividing by the total number of male flies. Then multiply by 100.
  6. Do this for red eyes and females
    7.
     

    Males

    Females

    Percentage of white eyes

     

    		  

    Percentage of red eyes

     

    		  

    Percentage of brown eyes

    		    

    Percentage of no wings

    		    

     

  7. Do these results match the predictions? Why or why not?

    8.  

     

     

  8. Make your next cross and write below. Predict your next cross in your journal.