The detectable traits of an organism as determined by what alleles are present is the phenotype.

Here's a breakdown:

* Genotype: The genetic makeup of an organism, represented by the specific alleles it carries.

* Phenotype: The observable physical and biochemical characteristics of an organism, resulting from the interaction between its genotype and the environment.

For example, a flower's genotype might include alleles for red petals and white petals. If the organism expresses the red petal allele, its phenotype will be red petals.