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Eight parental plants of tansy, Chrysanthemum vulgare, belonging to the camphor or thujone chemotypes, were crossed in 31 hybridizations. The progeny, containing 513 plant individuals, were analyzed by gas chromatography, which reveals at least three chemotypes among the offspring: camphor, thujone and sabinene. A schematic model for genetic control in the determination of the different chemotypes was worked out on the basis of this material. According to the model, at least seven of the loci controlling the biosynthesis of camphor and thujone must be assumed to be polymorphic.
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Lokki et al. (2009) studied this question.
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