Behavior Genetics

, Volume 14, Issue 6, pp 579–585 | Cite as

Effects of inbreeding on Raven Matrices

  • Nirupama Agrawal
  • S. N. Sinha
  • Arthur R. Jensen
Article

Abstract

Indian Muslim school boys, ages 13 to 15 years, whose parents are first cousins, were compared with classmates whose parents are genitically unrelated on the Raven Standard Progressive Matrices, a nonverbal test of intelligence. The inbred group (N=86) scored significantly lower and had significantly greater variance than the noninbred group (N=100), both on raw scores and on scores statistically adjusted to control for age and socioeconomic status. Genetic theory predicts both of these effects for a polygenic trait with positive directional dominance.

Key Words

inbreeding depression intelligence Raven matrices heritability polygenic theory 

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References

  1. Adams, M. S., and Neel, J. V. (1967). Childred of incest.Pediatrics 40:55–62.Google Scholar
  2. Bashi, J. (1977). Effects of inbreeding on cognitive performance.Nature 266:440–442.Google Scholar
  3. Böök, J. A. (1957). Genetical investigation in a north Swedish population: The offspring of first-cousin marriages.Ann. Hum. Genet. 21:191–221.Google Scholar
  4. Carter, C. O. (1967). Risk to offspring of incest.Lancet 1:436.Google Scholar
  5. Cohen, T., Block, N., Flum, Y., Kadar, M., and Goldschmidt, E. (1963). School attainments in an immigrant village. In Goldschmidt, E. (ed).,The Genetics of Migrant and Isolate Populations, Williams & Wilkins, Baltimore.Google Scholar
  6. Crow, J. F., and Kimura, M. (1970).An Introduction to Population Theory, Harper & Row, New York.Google Scholar
  7. Jensen, A. R. (1978). Genetic and behavioral effects of nonrandom mating. In, Osborne, R. T., Noble, C. E., and Weyl, N. (eds),Human Variation: The Biopsychology of Age, Race, and Sex, Academic Press, New York, pp. 51–105.Google Scholar
  8. Jensen, A. R. (1983). The effects of inbreeding on mental-ability factors.Personal. Indiv. Diff. 4:71–87.Google Scholar
  9. Kamin, L. J. (1980). Inbreeding depression and IQ.Psychol. Bull. 87:469–479.Google Scholar
  10. Neel, J. V. (1970). The effects of parental consanguinity and inbreeding in Hirado, Japan. II. Physical development, tapping rate, blood pressure, intelligence quotient, and school performance,Am. J. Hum. Genet. 22:263–286.Google Scholar
  11. Raven, J. C. (1960).Guide to the Standard Progressive Matrices, H. K. Lewis, London.Google Scholar
  12. Reed, W. E., and Reed, S. C. (1965).Mental Retardation: A Family Study. Saunders, Philadelphia.Google Scholar
  13. Schull, W. J., and Neel, J. V. (1965).The Effects of Inbreeding on Japanese Children, Harper & Row, New York.Google Scholar
  14. Schull, W. J., and Neel, J. V. (1972). The effects of parental consanguinity and inbreeding in Hirado, Japan. V. Summary and interpretation.Am. J. Hum. Genet. 24:425–453.Google Scholar
  15. Seemanova, E. (1971). A study of children of incestuous matings.Hum. Hered. 21:108–128.Google Scholar
  16. Slatis, H. M., and Hoene, R. E. (1961). The effect of consanguinity on the distribution of continuously variable characteristics.Am J. Hum. Genet. 13:28–31.Google Scholar

Copyright information

© Plenum Publishing Corporation 1984

Authors and Affiliations

  • Nirupama Agrawal
    • 1
  • S. N. Sinha
    • 1
  • Arthur R. Jensen
    • 2
  1. 1.Department of PsychologyUniversity of RajasthanJaipurIndia
  2. 2.School of EducationUniversity of CaliforniaBerkeley

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