The fruit fly, Drosophila, has either long wings or vestigial wings, as shown in Figure 2 below. Figure 2 Long-winged fly Vestigial-winged fly The size of the wings is determined by a pair of alleles: A and a. Long-winged flies have one of two possible genotypes: AA or Aa. Vestigial-winged flies have only one genotype: aa. a) Using the letters A and a give the genotype of a heterozygous fly. b) Why can vestigial-winged flies only have the genotype aa? c) A male and a female long-winged fly were crossed. They produced 96 offspring. Of the offspring 72 had long wings and 24 had vestigial wings. You may use a genetic diagram to explain this.

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