Exposure to the sun affects humans in different ways. After the same amount of exposure, some people can burn their skin, while others tan to a darker color. Which statement best explains these differences?
a) The genotype that regulates skin color is attributed to a single rigid phenotype.
b) There is a different gene that encodes for each type of skin color.
c) Flexibility in gene expression leads to differences in skin color and response.
d) Skin color is varied because individuals have rigid genotypes for skin color.
