Consider that a plant with genotype RR has red flowers and a plant with genotype WW has white flowers. This plant species expresses incomplete dominance for flower color when the plant is heterozygous.

Question

The offspring of a cross between an RR plant and a WW plant would be
A. Pink and white
B. Red and pink
C. All white
D. All pink

Answer 1

In the case of incomplete dominance, the heterozygous offspring display a phenotype that is a blend of the two homozygous phenotypes.

For this cross:

• The RR (red) plant has the genotype RR.
• The WW (white) plant has the genotype WW.

When these two plants are crossed, the offspring will all be heterozygous (RW), which will display a phenotype that is a blend of red and white. In this scenario, the blended phenotype is pink.

Therefore, the correct answer is: D. All pink.