Repeated USMLE Questions Step 1- 163

As physicians, we need to know some definitions in Genetics, which are related directly to our practice and guide us to diagnose and treat many genetic disorders. These items include genome, genotype, phenotype, genetic code, gene expression, etc.

Which one of the following choices describes the definition of a phenotype?

A- Genetic history of an organism

B- DNA structure that determines the expression of a trait

C- An observable physical or biochemical trait on an organism

D- Physical location of a trait on a DNA molecule


Answer:






Phenotype is the observable physical or biochemical features that seen on an organism featuring the expression of genotype.

The correct answer is C