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A purple flowering, smooth seed dihybrid plant (genotype PpSs)is test crossed with a white flowering, wrinkled...

A purple flowering, smooth seed dihybrid plant (genotype PpSs)is test crossed with a white flowering, wrinkled seed plant(genotype ppss).These produce progeny inthe following numbers of four phenotypes:24:76:74:26 (purple flower + smooth seed coat: purple flower + wrinkled seed coat: white flower + smooth seed coat: white flower + wrinkled seed coat). a)Explain how ratios of progeny show that the two genes are linked. b)How many map units separate the colour and seed coat genes? Show your calculations.

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