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A student carried out a genetic investigation with fruit flies, Drosophila melanogaster. Two characteristics were observed,...

  1. A student carried out a genetic investigation with fruit flies, Drosophila melanogaster. Two characteristics were observed, body colour and wing shape. The student had the followinginformation:
  • the characteristics were controlled by separate genes carried on separate chromosomes
  • grey body colour was dominant to black body colour
  • normal wing shape was dominant to bent wing shape.

The student carried out a cross between a fly heterozygous for both grey body colour and normal wing shape and a fly with a black body and bent wing. The numbers and phenotypes of the offspring were as follows:

grey body and normal wing            83

black body and normal wing           85

grey body and bent wing                78

black body and bent wing               74

  1. Complete a genetic diagram to explain this cross. You need to show the parental genotypes, the gametes, the genetic cross and phenotypes of the offspring. [5]

Use the following symbols to represent the alleles:

A = grey body colour, a = black body colour B = normal wing shape, b = bent wing shape

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