From Biology-Online Dictionary | Biology-Online Dictionary


noun, plural: genotypes

(1) (genetics) The entire set of genes in an organism

(2) (genetics) A set of alleles that determines the expression of a particular characteristic or trait (phenotype)

(3) (zoology) The genetic makeup of an individual or taxon



Of, pertaining to, relating to, describing a genotype


The genotype refers to the entire set of genes in a cell, an organism, or an individual. A gene for a particular character or trait may exist in two allelic forms; one is dominant (e.g. A) and the other is recessive (e.g. a). Based on this, there could be three possible genotypes for a particular character. For instance, a genotype of AA delineates homozygous dominance whereas a genotype of Aa is an example of heterozygous dominance. A genotype of aa is an instance of homozygous recessive. The genotype is a major factor that determines the phenotype of an organism. For example, the genotype determines the color of the petal of a pea plant.

Word origin: Greek genos (race) + Latin typus (type)


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Related term(s):

Related form(s):

  • genotypic (adjective)
  • genotypically (adverb)