Determine the genotypes of the parents and progeny

A)    In Drosophila (fruit flies) ebony body color and being eyeless are both autosomal recessive traits. An ebony fly is mated with an eyeless fly and the F1 are all wild type.

The F2 are:         

                        590 wild type

185 eyeless

200 ebony

72 eyeless and ebony



Test the hypothesis that this was a dihybrid cross (ratios) using the Chi Square test.

B)     A corn plant with purple, full kernels is crossed with a plant having purple, full kernels. The following progeny are obtained:


Purple, full                       100

Purple, shrunken              36

Yellow, full                       30

Yellow, shrunken              8


Determine the genotypes of the parents and progeny.


Test your hypothesis with a Chi square test until it is accepted.


  1. -Chi square,
  2. -degrees of freedom
  3. -probability
  4. -accept/reject

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