a) 9/16
possible genotypes : BBRR, BBrR, bBRR, bBrR, BBRr, bBRr, BbRR, BbrR, BbRr
b) 3/16
possible genotypes : BBrr, bBrr, Bbrr
c) 3/16
possible genotypes: bbRR, bbrR, bbRr
d) 1/16
possible genotype : bbrr
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