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Johnson CA, Ahern FM, Johnson RC. Level of functioning of siblings and parents of probands of varying degrees of retardation. Behav Genet. 1976;6(4):473-7doi: 10.1007/BF01065704.
Johnson, C. A., Ahern, F. M., & Johnson, R. C. (1976). Level of functioning of siblings and parents of probands of varying degrees of retardation. Behavior genetics, 6(4), 473-7. https://doi.org/10.1007/BF01065704
Johnson, C A, et al. "Level of functioning of siblings and parents of probands of varying degrees of retardation." Behavior genetics vol. 6,4 (1976): 473-7. doi: https://doi.org/10.1007/BF01065704
Johnson CA, Ahern FM, Johnson RC. Level of functioning of siblings and parents of probands of varying degrees of retardation. Behav Genet. 1976 Oct;6(4):473-7. doi: 10.1007/BF01065704. PMID: 988824.
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Behav Genet. 1976 Oct;6(4):473-7. doi: 10.1007/BF01065704.

Level of functioning of siblings and parents of probands of varying degrees of retardation.

Behavior genetics

C A Johnson, F M Ahern, R C Johnson

PMID: 988824 DOI: 10.1007/BF01065704

Abstract

A further analysis of already published data supports the position that retardates of low ability level less frequently have retarded siblings, retarded parents, and parents low in occupational level than do retardates higher in ability level. The analysis supports the position that there are two types of retarded individuals, persons retarded as a result of gene or chromosomal anomalies, brain injury, etc., who more frequently occur in the lower-level retardate group, and persons whose retardation represents polygenic segregation, who more frequently occur in the higher-level group.

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References

  1. Soc Res (New York). 1974;41(3):387-425 - PubMed
  2. Eugen Rev. 1952 Jul;44(2):71-83 - PubMed

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