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 constitution 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