In fish of the species Perissodus microlepis, some individuals have mouths that open to the...

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In fish of the species Perissodus microlepis, some individuals have mouths that open to the right and some individuals have mouths that open to the left. The direction of the mouth opening is a genetic trait controlled by a single gene. The allele for a right-opening mouth (R) is dominant to the allele for a left-opening mouth (r). If two fish heterozygous for the mouth trait are crossed, what is the expected ratio of phenotypes in the offspring? A 1 right-opening mouth : 3 left-opening mouth B 2 right-opening mouth : 2 left-opening mouth C 3 right-opening mouth : 1 left-opening mouth D 4 right-opening mouth 0 left-opening mouth

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