A cross of Drosophila Melanogester produced some strange results. The parental c

Question

A cross of Drosophila Melanogester produced some strange results.

The parental cross is Black body X Purple eyes

The F1 all look wild-type (normal body color and normal eye color)

The F2 offspring are: 100 Black body with wildtype eyes

                                    95 Wildtype body with purple eyes

                                    27 Black body with purple eyes

                                    19 Wildtype body color and eye color

What is the distance between the two genes?

Please show and explain the process.

Explanation / Answer

Distance between the two genes = No. of recombinant / total no. of offsprings x 100.

Parental gamete = 27 Black body with purple eyes

Total No.of Offsprings = 214

Recombinant = 100 Black body with wildtype eyes ; 95 Wildtype body with purple eyes

Distance between the two genes = 100*(100+95/214) = 91.1cm

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