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Haworth, Claire M. A.; Dale, Philip; Plomin, Robert – International Journal of Science Education, 2008
We investigated for the first time the genetic and environmental aetiology behind scientific achievement in primary school children, with a special focus on possible aetiological differences for boys and girls. For a representative community sample of 2,602 twin pairs assessed at age nine years, scientific achievement in school was rated by…
Descriptors: Twins, Genetics, Environmental Influences, Elementary School Students
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Eley, Thalia C.; Dale, Philip; Bishop, Dorothy; Price, Thomas S.; Plomin, Robert – Journal of Educational Psychology, 2001
Etiology of verbal and performance delays were investigated in a large population sample of twins at 2 and 3 years (N=2,449 pair). Longitudinal genetic analyses indicated substantial heritability of verbal delay from 2 to 3 years, especially in combination with performance delay. Results suggest a strong genetic contribution to verbal delay…
Descriptors: Biological Influences, Cognitive Ability, Cognitive Development, Developmental Delays