In plea plants, the allele for purple flowers, P, is dominant over the allele for white flowers, p. Which conclusion about phenotype and genotype is possible?

Question

Options:
If a plant has purple flowers, then its genotype must be Pp.
If a plant has purple flowers, then its genotype must be PP.
If a plant has white flowers, then its genotype must be Pp.
If a plant has white flowers, then it’s genotype must be pp.

Answer 1

Based on the information provided, 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). Therefore, if a plant has purple flowers, it can have either one copy of the dominant allele (P) and one copy of the recessive allele (p) (Pp genotype) or two copies of the dominant allele (PP genotype).