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McEwen, Fiona; Happe, Francesca; Bolton, Patrick; Rijsdijk, Fruhling; Ronald, Angelica; Dworzynski, Katharina; Plomin, Robert – Child Development, 2007
Imitation, vocabulary, pretend play, and socially insightful behavior were investigated in 5,206 same- and opposite-sex 2-year-old twin pairs in the United Kingdom. Individual differences in imitative ability were due to modest heritability (30%), while environmental factors shared between twins (42%) and unique to each twin (28%) also made…
Descriptors: Foreign Countries, Teaching Methods, Twins, Play
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Walker, Sheila O.; Petrill, Stephen A.; Spinath, Frank M.; Plomin, Robert – British Journal of Educational Psychology, 2004
Background: Twin research has consistently shown substantial genetic influence on individual differences in cognitive ability; however, much less is known about the genetic and environmental aetiologies of school achievement. Aims: Our goal is to test the hypotheses that teacher-assessed achievement in the early school years shows substantial…
Descriptors: Teaching Methods, Foreign Countries, Environmental Influences, Cognitive Ability
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Welsh, Paul – Journal of College Science Teaching, 2004
Based on an actual event, this case study focuses on problems associated with reproductive technologies. It tells the story of the "Jones" who, after in vitro fertilization, discovered that their fraternal twins were less similar in appearance than one would expect two brothers to be. Students work in teams to unravel the mystery using DNA…
Descriptors: Twins, Genetics, Case Studies, Teaching Methods