Let R = red pigment and r = no pigment.In carnations,RR offspring make a lot of red pigment,rr offspring make no pigment and Rr offspring make a small amount of red pigment,thus appearing pink.Pink carnations are therefore an example of
A)codominance.
B)incomplete dominance.
C)epistatic interaction.
D)blending.

Question

Quizplus · Accepted Answer

Incomplete dominance is the inheritance pattern in which the heterozygote (Rr) exhibits an intermediate phenotype, distinct from either homozygote (RR or rr). This intermediate phenotype of pink color is observed in carnations, making incomplete dominance the best choice. Codominance would require both traits to be fully expressed in the heterozygote, which is not the case in the pink carnations. Epistatic interactions involve genes at different loci interacting to affect the expression of a trait, which is not applicable in this scenario. Blending was a classical theory of inheritance where the traits of the parents were thought to mix in the offspring, creating an intermediate phenotype. However, we now understand that inheritance is more complex and influenced by factors such as dominance and incomplete dominance.

Let R = Red Pigment and R = No Pigment