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 allele for blue hydrangea being completely dominantb. the knowledge that multiple alleles are involvedc. environmental factors such as soil pHd. the alleles being codominant

c. environmental factors such as soil pH

Explanation:

Some traits are controlled by both genetics and environment. Two twins with identical genetic makeup will also have different traits due to exposure to different environment.

Hydrangea is one of the plants on which environment has major effect. It has blue flowers in acidic soil and pink flowers in alkaline soil. Hence soil pH affects the colour of Hydrangea flowers. Plants with same genotype can also produce different coloured flowers due to difference in surrounding environment. Since it has been given that all the planted flowers had same genotype, existance of multiple alleles or the relationship between the alleles have no effect on the difference in colour of flowers.