Drosophila strain Ly (Lyra), Sb(stubble) and br (brown) wascrossed with a wild type strain. The F1 females were crossedto + ,+, br homozygous males. The F2 were collected andcounted. The table below shows the results obtained.
Phenotype offlies Number
Ly, Sb,br 404
Ly, +,+ 18
+, Sb,br 16
Ly, +,br 75
+, Sb,+ 59
Ly, Sb,+ 4
+, +,br 2
a) Draw a diagram to show the genetic crosses involved.
b) Find the genetic distances between the three genes.
c) Calculate the coefficient of coincidence and alsointerference.
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