Punnett Square[tex]\left[\begin{array}{ccc}&R&r\\R&RR&Rr\\r&Rr&rr\end{array}\right][/tex]AllelesR = Red-to-black (dominant)r = Black (recessive)Possible GenotypesRR (Red-to-black)Rr (Red-to-black, carrier of black)rr (Black)Genotype Ratio1 RR : 2 Rr : 1 rr