Answer:
Genotype of homozygous parent with white flower: WW
Genotype of homozygous parent with red flower: RR
Step-by-step explanation:
An organism that is homozygous for a particular trait has the same allele representing the trait while heterozygous individuals have different alleles representing a trait.
Since the allele for white flower color is W and that of red flower is R, homozygous parent plant with white flower will have WW as genotype while homozygous parent plant with red flowers will have RR as genotype.
The correct answer is WW for homozygous white flower parent and RR for homozygous red flower parent.