Your skin pigmentation is expressed by your

A) allele.
B) gene locus.
C) genotype.
D) phenotype.

Skin pigmentation is a physical trait that is expressed through an individual's phenotype, or observable characteristics. The other choices - allele, gene locus, and genotype - all refer to aspects of an individual's genetic makeup. While a person's genotype and allele composition can influence their skin pigmentation, it is ultimately the manifestation of that genetic information in physical form that determines a person's skin color.