To calculate for the number of genes controlling a phenotype:
where r = proportion of offspring exhibiting extreme phenotypes in F2
n = number of genes controlling the trait
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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