Given
Purple flower = dominant (P)
White flower = recessive (p)
Parental Cross (P generation)
Purple homozygous × White homozygous
PP×pp
F1 Generation
Gametes:
PP → all P
pp → all p
Punnett square:
P P
p Pp Pp
p Pp Pp
F1 Results
Genotype: 100% Pp
Phenotype: 100% Purple
F2 Generation
Now cross two F1 plants:
Pp×Pp
Punnett square:
P p
P pp Pp
p Pp pp
F2 Genotypic Ratio
1 PP : 2 Pp : 1 pp