Describe behaviors associated with specific genetic or chromosomal conditions, and where these behaviors are related to that particular condition. These syndromes have fairly predictable behavioral presentations and developmental sequelae, and may also be induced by environmental conditions. The term ‘behavioral phenotype’ was first used in a study published in 1972 that attempted to describe the behavioral profile of Cornelia de Lange syndrome (a rare genetic disease, involving chromosome 5, with distinctive facial features and autistic-like behaviors). The behavioral phenotypes of some genetic or chromosomal disorders (e.g., Williams syndrome) are not so clear-cut.
See 22q11 deletion (CATCH 22) syndrome, Angelman syndrome, Chromosome, Genotype and phenotype, Prader-Willi syndrome, Williams syndrome