T H A T genetic mutations are prerequisite to evolution of the species is well recognized. The mechanism by which such mutations are segregated and recombined in bisexual species forms a large part of classical genetics. Less well known are the modifications, in unisexual species, of the same mechanisms to attain comparable ends. The segregation of genes in aberrant cases of diploid parthenogen...

Objective: To translate into Portuguese, back-translate, culturally adapt and validate a screening instrument for pervasive developmental disorder, the Autism Screening Questionnaire, for use in Brazil. Method: A sample of 120 patients was selected based on three groups of 40: patients with a clinical diagnosis of pervasive developmental disorder, Down syndrome, or other psychiatric disorders. ...