Hydrangeas are a flowering plant with large showy blooms. When a plant is grown in aluminum-rich soil, it has blue flowers; if the same plant is transplanted into soil that is lacking aluminum, the flowers produced will be pink. This is an example of
A) environmental effects.
B) codominance.
C) incomplete dominance.
D) polygenetic inheritance.
E) monohybrid inheritance.

Question

Quizplus · Accepted Answer

Codominance occurs when the heterozygote shows both of the parental phenotypes equally. Incomplete dominance is when the heterozygote expresses a different variation from both the homozygous dominant and the homozygous recessive genotype. Since the phenotype of the flowers depends on an external condition, this is an example of environmental effects on gene expression. Polygenic inheritance is when two or more genes regulate a trait. Monohybrid inheritance is when a trait has a dominant and recessive variation.

Hydrangeas Are a Flowering Plant with Large Showy Blooms