This is a schematic diagram of an agarose gel used to analyze the DNA fragments generated by analyzing individual female flies with primers P1, P2, and P3 in a single PCR reaction. Lane M represents DNA fragments that are size markers (standards). In lanes 1, 2, and 3, sketch in the DNA fragments expected to be produced by PCR for female Drosophila homozygous for wild-type, heterozygous, and homozygous for the white-one mutation, respectively:

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