The color of the petals in a carnation is determined by an incomplete dominance pattern. The Punnett square is used to determine the genotypes of the offspring of a homozygous red (RR) and a homozygous white (rr) carnation.

Question

According to the Punnett square, what color of petals could result from the pairing of these plants?
A.

only red flowers

B.

only pink flowers

C.

white and red flowers

D.

red and pink flowers

Answer 1

In the case of incomplete dominance, when a homozygous red (RR) carnation is crossed with a homozygous white (rr) carnation, all the offspring will have the heterozygous genotype (Rr). In incomplete dominance, the phenotype of the heterozygous individuals (Rr) is a blend of the two parental traits.

In this case, since red is represented by R and white by r, the offspring (Rr) would exhibit a phenotype of pink flowers. Therefore, the correct answer is:

B. only pink flowers.