Answer: The correct answer is 1 phenotype.
Dominant trait ( depicted by capital letter) masks the expression of recessive trait ( depicted by small letter).
As per the question, purple flower color is dominant and red flower color is recessive. Let 'P' allele corresponds to purple color and 'p' corresponds to red color.
The possible genotypes for purple flower is 'Pp' and 'pp' whereas for red flower is 'pp'.
Genotypes of parent plants, which are homozygous for purple and homozygous for red are PP and pp respectively.
When these plants are crossed, they result into heterozygous purple (Pp) offspring that is phenotype of all offsprings in first generation is Purple
Refer punnett square.
