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In this experiment we crossed the traits of flies to examine which traits pass on to offspring and which do not. I did about eight trials and in most of them the wild type was the dominant trait.

 

1)     1)  Wild type (+)     x      Singed Wings (SN).       P1=+    F1=+

2)     2)  Wild type (+)     x      Curly Wings (CY).           P1=+   F1=+

3)     3)  Wild type (+)     x      Bar Eye Shape (B).         P1=B    F1= B:+// 2:1

4)     4)  Wild type (+)     x      Crossveinless (CV).       P1=+    F1=+

5)     5)  Wild type (+)     x      Dichaete (D).                  P1=+    F1=+

6)     6) Wild type (+)     x      Miniature (M).               P1=+    F1=+

7)     7) Wild type (+)     x      Lobe (L).                          P1=L    F1=+

8)     8)  Lobe (L)              x      Purple (PR).                    P1=L    F1=+:PR:L:PRL//1:5:18:1

 

However, from this data I concluded that one trait that is more dominant than the wild type is the eye shape. As is evidenced with trials three, seven, and eight, the eye shape wins. In trials three and seven, when a wild type and eye shape were crossed, the offspring (P1) had dominant eye shape (either bar or lobe). When the offspring were crossed (F1) it consisted of a ratio of 2 to 1, bar shape to wild type.

 

Trial eight was interesting. I’m not sure if I did it wrong but when I crossed Lobe eye shape with Purple eye color, the eye shape was once again dominant. However, when the offspring crossed, there was a ratio of  1 to 5 to 18 to 1 or widltype to purple to lobe to purple lobe.  The highest number in this ratio was, of course, 18 which goes with the Lobe trait. Again, I find evidence that eye shape is the most dominant trait.

 

 

~Valerie Donely