Hydrangea plants of the same genotype are planted in a large flower garden. Some of the plants produce blue flowers and others pink flowers. This can be best explained by which of the following?
A) the knowledge that multiple alleles are involved
B) the allele for blue hydrangea is completely dominant over the allele for pink hydrangea
C) the alleles are codominant
D) environmental factors such as soil pH affect the phenotype

Question

Quizplus · Accepted Answer

The color of hydrangea flowers can vary due to environmental factors such as soil pH. In acidic soils, hydrangeas produce blue flowers while in alkaline soils they produce pink flowers. Therefore, the presence of different flower colors in the hydrangea plants of the same genotype can be best explained by the influence of soil pH on the phenotype.

Hydrangea Plants of the Same Genotype Are Planted in a Large