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The observable characteristics of an organism. Normally depends on the organism's genotype and environment.


The combination of alleles an organism has.


A version of a gene.


Two different alleles that are both fully expressed in the phenotype.

Incomplete Dominance

Two different alleles that are each partially expresed in the phenotype, creating a blending effect.


An allele that is always observed in the phenotype.


An allele that is only observed in the phenotype if no dominant allele is present.


Many genes all influencing a characteristic (like height or skin color).

Multiple Alleles

A single gene that has more than two possible alleles.

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