Essay
In the common daisy,the genes A and a and B and b represent two pairs of alleles acting on flower colour.A and B are required for colour.The alleles of these two genes show recessive epistasis.The two gene pairs together thus show duplicate recessive epistasis.Predict the genotypes and phenotypes of the F2 of a cross between two colourless plants,one homozygous for A and the other homozygous for B.9 Black;7 colourless
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