What is the map distance between white and diminutive

White eye (w) female Drosophila are crossed with diminutive (dm) males. The F1 wild type females are then crossed to the double mutant, white eye, dimunutive males and produce the following:

white eye, normal size: 487
normal eye, diminutive: 475
normal eye, normal size: 19
white eye, diminutive: 12

Show the crosses, use proper symbols.
What is the map distance between white and diminutive?

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