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| Modern Genetic Analysis Chapter 7. Gene Mutations Mutational Analysis Figure 7-33. Germinal mutation determining white petals in viper's bugloss (Echium vulgare). A recessive germinal mutation, a, arose in an A / A blue plant of the preceding generation, making its germinal tissue A / a. Upon selfing, the mutation was transmitted to progeny, some of which were a / a and expressed the mutant phenotype. (Anthony Griffiths)

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