In the fruit fly Drosophila melanogaster, red eye colour (R) is dominant to white eye colour (r). A student wishes to perform a test cross to determine whether a female red eyed fruit fly is homozygous or heterozygous for the eye colour. The student mates the female fruit fly with a red eye coloured male and studies the offspring, which are 100% red eye. The student concludes that the genotype of the female fruit fly Drosophila melanogaster is "RR". Suggest the best way by which a breeder could successfully maintain a supply of red eye Drosophila melanogaster of the variety that is heterozygous for eye colour

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