Abstract
Introduction: 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.
Highlights
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
According to table 3, students with the investigative personality type show a better performance in intelligence tests
The results of table 5 indicate that this difference in intelligence is to the advantage of individuals with the investigative personality type
Summary
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. Numerous genetic disorders and diseases are reported to have originated from consanguineous marriage, including neural tube defect, congenital heart disease, autosomal recessive deafness, and visual defects such as early-onset retinal dystrophy, congenital glaucoma, enophthalmos, bilateral retinoblastoma, and congenital hypothyroidism )Shomali, Montazeri, Akrami, Heshmat & Larijani, 2007]. Another issue affected by consanguineous marriage is intelligence. Based on three cognitive ability tests, he found out that, on average, children of double-first cousins or bilateral relatives by blood up to the third degree of kinship score lower on intelligence compared with children of first cousins or third-degree marriages who, in turn, score lower on intelligence compared with children of non-consanguineous marriages. Jensen (1983) concluded that consanguineous marriages reduce the IQ of children by 2.5 to 3.5 scores
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