Complex Patterns of Inheritance

By Edgar G.

Multiple Alleles

An allele of a genetic locus having more than two allelic forms within a population.

There are multiple phenotypes.

Human ABO Blood type, rabbit coat color

Incomplete Dominance

One allele does not completely dominate another allele, and therefore results in a new phenotype.


wavy hair from parent with straight and parent with curly, grey sheep


A relationship between two versions of a gene. Individuals receive one version of a gene, called an allele, from each parent.

merge, different

short hair and long hair dogs produce medium hair offspring, high voice low voice produces medium voice

Polygenic Traits

One whose phenotype is influenced by more than one gene.

influenced more by one trait

Height, voice, hair etc.