The genotype is AABB. What is the phenotype?, White – the dominant A allele inhibits the conversion of white to green, so the pathway is blocked at the first step. Even though B is present, it has no effect., The genotype is AABb. What is the phenotype?, White – the dominant A allele prevents white being converted to green, so no substrate is available for enzyme 2., The genotype is AAbb. What is the phenotype?, White – A inhibits the first step, so the fruit remains white. The bb genotype does not matter because the pathway is already blocked., The genotype is AaBB. What is the phenotype?, White – one dominant A allele is enough to inhibit the first step, so white pigment remains., The genotype is AaBb. What is the phenotype?, White – A blocks the conversion of white to green, so gene B cannot act., The genotype is Aabb. What is the phenotype?, White – the dominant A allele prevents the formation of green pigment, so the fruit stays white., The genotype is aaBB. What is the phenotype?, Yellow – no dominant A allele means the first step occurs (white → green), and B allows enzyme 2 to convert green to yellow., The genotype is aaBb. What is the phenotype?, Yellow – aa allows green to form, and B produces a functional enzyme to convert green to yellow., The genotype is aabb. What is the phenotype?, Green – aa allows the first step (white → green), but bb means no functional enzyme 2, so green cannot be converted to yellow.

Epistasis

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