The physical expression of genes

A physical expression of genes is what is known as a phenotype. A phenotype gives the appearances of organisms based on how it's gene are expressed and put together in a functioning form.

The physical expression of genes are phenotype. Phenotype is the expression of the gene by the appearnace of the organism. It is the characteristics of that trait.

Examples : When pigment is made in our eyes, height (tall and short), weight, blond hair is the phenotype for the blond hair genotype and skin colour (black, white) is the phenotype trait.