Here's a breakdown:
* Genotype: The genetic makeup of an organism, represented by the combination of alleles it possesses.
* Phenotype: The observable characteristics of an organism, resulting from the interaction of its genotype with the environment.
For example, a person with the genotype "BB" for eye color will have brown eyes (phenotype), while a person with the genotype "bb" will have blue eyes. Both individuals have different genotypes, but the same phenotype (eye color) could be expressed.