You want to find the gene for dog nose color. You know that pink is dominant to black. You cross a homozygous pink-nosed female with a black-nosed male. Their F1 progeny all have pink noses. You do the reciprocal cross of a black-nosed female and a homozygous pink-nosed male. Their F1 progeny also all have pink noses. You then cross the two litters of F1 puppies. Their progeny have a 3:1 pink-to-black nose phenotypic ratio; these nose phenotypes appear equally in both male and female puppies. Where is the gene for nose color most likely to be?

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