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Multifactorial inheritance disorders result from the interaction of many genes that also interact with environmental influences. For instance, disorders such as depression, schizophrenia, and attention deficit/hyperactivity disorder (ADHD) are believed to result from the interaction of many genes with environmental influences. To discover which genes are implicated in these disorders, genome-wide association tests are being carried out comparing the genomes of individuals who have each disorder with similar individuals who do not, but this research is in its very early stages (NHGRI, 2015b). However individuals can take preventative steps when they know from their family history that they are at higher risk of developing a disorder. For example, an individual who has many family members with major depression can learn to identify those symptoms early to get appropriate treatment if needed.

Multifactorial inheritance disorders: Disorders that result from the interaction of many genes and environmental influences.