If a plant with purple petals (PP) is crossed with a plant with white petals (pp), what is the phenotype for the F1 generation?

Each F1 offspring receives a P allele from the purple-petaled parent and a p allele from the white-petaled parent, so all have genotype Pp. Since purple (P) is dominant over white (p), the F1 plants have purple petals, matching choice A.

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