* Genotype refers to the specific combination of alleles an organism possesses for a particular gene.

* Alleles are alternative forms of a gene.

Since each gene has two copies (one from each parent), the genotype is made up of the two alleles that the organism inherited for that gene.

For example:

* Gene: Eye color

* Alleles: Brown (B), Blue (b)

Possible Genotypes:

* BB: Homozygous dominant (Brown eyes)

* Bb: Heterozygous (Brown eyes)

* bb: Homozygous recessive (Blue eyes)