In pea plants, the allele for purple flowers, P, is dominant over the allele for white flowers, p. Which conclusion about phenotype and genotype is possible?
If a plant has white flowers, then its genotype must be Pp .
If a plant has white flowers, then its genotype must be pp .
If a plant has purple flowers, then its genotype must be Pp .
If a plant has purple flowers, then its genotype must be PP.
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The correct conclusion is: If a plant has purple flowers, then its genotype must be Pp. This is because the allele for purple flowers (P) is dominant over the allele for white flowers (p), meaning that even if an individual has one allele for purple flowers and one allele for white flowers, it will still express the purple flower phenotype. The genotype PP would result in purple flowers as well, but it is not the only possible genotype for individuals with purple flowers.
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