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". What mistake(s) did the student make if any? Briefly explain in bullet points

Question

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".
What mistake(s) did the student make if any? Briefly explain in bullet points

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