Which statement best distinguishes genotype from phenotype?

Which statement best distinguishes genotype from phenotype?

• A. Genotype is the genetic makeup
• B. Genotype is the genetic makeup; phenotype is the physical traits.
• C. Phenotype is the genetic makeup
• D. Genotype and phenotype refer to the same concept

Answer: (B)

Genotype refers to the genetic makeup—the specific genes and alleles an organism carries. Phenotype is the observable expression of those genes—the physical traits and characteristics you can see or measure, like eye color or height—which result from how the genotype is expressed in a given environment. This distinction matters because the same genotype provides the potential for certain traits, but environmental factors can influence how (or whether) that potential is realized in the phenotype. For example, eye color is determined by genes (genotype), while height is influenced by both genes and nutrition (phenotype). The statement that genotype is the genetic makeup and phenotype is the physical traits captures this relationship most clearly.

Genotype refers to the genetic makeup—the specific genes and alleles an organism carries. Phenotype is the observable expression of those genes—the physical traits and characteristics you can see or measure, like eye color or height—which result from how the genotype is expressed in a given environment. This distinction matters because the same genotype provides the potential for certain traits, but environmental factors can influence how (or whether) that potential is realized in the phenotype. For example, eye color is determined by genes (genotype), while height is influenced by both genes and nutrition (phenotype). The statement that genotype is the genetic makeup and phenotype is the physical traits captures this relationship most clearly.