Skin color in humans is at least partially hereditary; dark-skinned parents tend to have dark-skinned children. But humans come in a range of skin tones. Which extension of Mendel's model accounts for the hereditary variation in human skin color?

Which of the following phenotypes is an example of polygenic inheritance?

A pleiotropic genetic disorder typically has what characteristics?

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 phenotype is controlled by gene A and gene B. Gene B controls the expression of gene A. This is an example of _____.