consider that a plant with genotype RR has red flowers and a plant with genotypes WW has white flowers. This plant species expresses incomplete dominance for the flower color when the plant is heterozygous. The offspring of a cross between RR plant and WW plant would be
a. all pink
b. red and pink
c. all white
d. pink and white
Incomplete dominance is a form of intermediate inheritance in which one allele for a specific trait is not completely expressed over its paired allele. This results in a third phenotype where the expressed physical trait is a combination of the phenotypes of both alleles.
Given that RR plants have red flowers and WW plants have white flowers, and the trait expresses incomplete dominance, when a heterozygous plant is produced from the cross, it will have a phenotype that is intermediate between the two parent phenotypes.
Therefore, if we cross an RR plant with a WW plant, the offspring will all have the genotype RW. This RW genotype will express the intermediate phenotype, which in this case is pink.
Hence, the correct answer is:
a. all pink