In a plant, three dominant independently assorting genes A, B and C are essential for production of purple pigment. If any of the genes or all three genes are present in recessive condition then flower is colourless.
Raw material A→XB→YC→Z pigment
A purple plant with genotype AABBCC cossed with a clourless plant with genotype aabbcc gives purple F1 hybrid. On selfing of F1, what will be the proportion of coloured offspring in F2?