Rr = SP - coloured seed and coloured (red) plant
Rg = Sp = coloured seed and green plant
rr = sP = colourless seed and coloured (red) plant
rS = sp = colourless seed and green plant
The new designations were based on the assumption that S and P are two closely linked genes rather than forming a series of multiple alleles. But since alleles later called pseudoalleles, can undergo crossing over between them, the concept of multiple alleles may apply in this case.
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