The alleles for eye color and for body color are on the X chromosome of Drosophila, but not on the Y. Red eye color (w+) is dominant to white eye color (w), and tan body color (y+ ) is dominant to yellow body color (y). What is the genotype of a yellow-bodied, red-eyed female who is homozygous for eye color?

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The female with red eyes and a yellow body must be homozygous recessive for the yellow body color allele. She is homozygous dominant for the eye color allele. Her genotype would be Xw+y Xw+y.