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Download full textVan den Daele, Leland D. – Journal of Genetic Psychology, 1972
A classification of natal influences is proposed with a model of their operation. Natal influences affect maternal capacity, maternal load, and maternal efficiency. Since maternal load is increased in twin pregnancy, results of twin studies must be generalized with caution. The method of co-twin control is exemplified by examination of a small…
Descriptors: Bibliographies, Genetics, Heredity, Individual Characteristics
