Polygenic Disorder: Genetic disorder resulting from the combined action of alleles of more than one gene (e.g., heart disease, diabetes, and some cancers). Although such disorders are inherited, they depend on the simultaneous presence of several alleles: thus the hereditary patterns usually are more complex than those of single-gene disorders.

 

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Polygenic Disorder: Genetic disorder resulting from the combined action of alleles of more than one gene (e.g., heart disease, diabetes, and some cancers). Although such disorders are inherited, they depend on . . . View Full Definition

Single- Gene Disorder: Hereditary disorder caused by a mutant allele of a single gene (e.g., duchenne muscular dystrophy, retinoblastoma, sickle cell disease). Compare polygenic disorders.

Reactive Attachment Disorder: A condition with onset before age 5, resulting from an early lack of consistent care, characterized by a child's or infant's inability to make appropriate social contact with others. Symptom . . . View Full Definition

Polygenic Inheritance: Occurs when a trait is controlled by several gene pairs; usually results in continuous variation.