Cross between homozygous black rough (BB...

Cross between homozygous black rough (BBRR) guinea pig and homozygous white smooth guinea pig (bbrr) produced black and rough animals in `F_(1)` generation. Presuming the genes to be present on different chromosomes, the percentage of `F_(2)` individuals which are heterozygous for both the gene pairs would be

0.25

0.35

0.5

0.75

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