Lesson 3: Key Terms - Phenotype and Genotype

Genotypes and phenotypes are important, they explain how different characteristics arise.

Genotypes and Phenotypes

Genotype

A genotype is the complete set of genetic material - or the genetic constitution. 

  • It's an individual's collection of genes.
  • It can also refer to two alleles inherited for a particular gene.
  • The genotype is expressed when the information encoded in the genes' DNA is used to make protein and RNA molecules.

Phenotype

A phenotype is the observable traits.

  • Its determined by the interaction between an organism's genetic constitution as well as its environment.
  • Phenotypic traits are often visible.