In a cross between a strain of large guinea pigs and a strain of small guinea...

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In a cross between a strain of large guinea pigs and a strain of small guinea pigs, the F₁ are phenotypically uniform, with an average size about intermediate between that of the two parental strains. Among 1017 F₂ individuals, 1 is about the same size as the small parental strain and 1 is about the same size as the large parental strain. How many gene pairs are involved in the inheritance of size in these strains of guinea pigs? In a cross between a strain of large guinea pigs and a strain of small guinea pigs, the F₁ are phenotypically uniform, with an average size about intermediate between that of the two parental strains. Among 1017 F₂ individuals, 1 is about the same size as the small parental strain and 1 is about the same size as the large parental strain. How many gene pairs are involved in the inheritance of size in these strains of guinea pigs?

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