Here's a breakdown:

* Genotype: The genetic makeup of an organism, represented by the combination of alleles (alternative forms of a gene) an individual possesses. For example, "BB", "Bb", or "bb" are possible genotypes for eye color.

* Phenotype: The observable characteristics of an organism, determined by the genotype and environmental influences. For example, "brown eyes" is a phenotype that could be caused by the genotypes "BB" or "Bb".

Think of it like this: The genotype is the blueprint, and the phenotype is the actual building. The genotype provides the instructions for the phenotype, but environmental factors can also influence how the phenotype develops.