The Biology of Mental Defect

Aa aa aberration abnormal affected Amer anencephaly associated autosomal average Barr body Binet biological birth brain cause cells cent cerebral child clinical coefficient Colchester Survey condition congenital syphilis consanguinity correlation deficiency diagnosis diplegia disease dominant dystrophia myotonica environment epilepsy epileptic estimated example factors families father feeble-minded females fertility Figure foetal foetus frequency gene genetical hereditary heterozygous hospital human Huntington's chorea hydrocephaly idiocy idiots imbeciles incidence infants inheritance intellectual intelligence level intelligence quotient karyotype Lancet low-grade male malformations maternal age mating mean I.Q. measurements Ment mental defect mental grade mental illness mental subnormality microcephaly mild mongolism mother mutation neurological non-disjunction normal observed occur offspring onset pairs parents patients pedigrees Penrose phenylketonuria physical population pregnancy produce Psychiat rare recessive recessive gene relatives reported sex chromosomes sex-linked sibs sibships social spina bifida stature symptoms syndrome TABLE tests tion traits twins usually X chromosome