Question

an organisms physical expression of a trait is called a(n)
genotypedominant traitphenotyperecessive trait

Explanation:

In biology, the term "phenotype" refers to the observable physical or biochemical characteristics of an organism, which result from the interaction of its genotype (genetic makeup) with the environment. The genotype is the genetic code, while the phenotype is the physical expression. A dominant trait is one that masks the expression of a recessive trait when both are present in the genotype. A recessive trait is only expressed when two copies of its allele are present. Since the question asks for the physical expression of a trait, "phenotype" is the correct term.

Answer:

phenotype