A Comparative Study of Intelligence in Children of Consanguineous and Non-consanguineous Marriages and its Relationship with Holland’s Personality Types in High School Students of Tehran

The present research aims to study and compare  intelligence in children of consanguineous and non-consanguineous  marriages and its relation with Holland’s personality types. Methodology: This is a descriptive study and uses an ex-post facto design. The statistical population is comprised of all high school  students of Tehran province in the school year 2010-2011. The sample size includes 1,221 students, 628 of whom are children of consanguineous marriages and 593 are children of non-consanguineous  marriages. The researchers employed Raven’s Progressive Matrices Test  and Holland Code (RIASEC) Test for data collection. Findings: T-test results indicate that there is no signifiant difference  in intelligence between children of consanguineous marriages and those  of non-consanguineous marriages. However, descriptive data indicate  that the mean IQ in children of consanguineous marriages is one unit  lower than those of non-consanguineous marriages. Also, the results  of variance analysis reveal that the difference in intelligence between  different personality types is signifiant. Tukey’s post hoc test results indicate that students with an investigative personality type have a higher  intelligence compared with those with other personality types.