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  • 1
    Electronic Resource
    Electronic Resource
    Logic of animal conflict (1975)
    [s.l.] : Nature Publishing Group
    Nature 254 (1975), S. 463-463 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] MAYNARD-SMITH and Price have shown1 that it is not necessary to invoke group selection to explain the occurrence of 'conventional' rather than 'dangerous' tactics in animal conflict. The conditions for the evolution, under individual selection, of populations in which conventional tactics ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/254463b0
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  • 2
    Electronic Resource
    Electronic Resource
    Detection of the effects of asymmetric assortative mating (1981)
    [s.l.] : Nature Publishing Group
    Nature 289 (1981), S. 205-206 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The model assumes that assortative mating is based on a composite aspect of the phenotype, 'fitness', and is necessarily symmetric at this level. Asymmetry in mate selection arises because the sexes differ in the contribution of particular genetic effects to this composite phenotype, thus the ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/289205a0
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  • 3
    Electronic Resource
    Electronic Resource
    Education policy and the heritability of educational attainment (1985)
    [s.l.] : Nature Publishing Group
    Nature 314 (1985), S. 734-736 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Adult twins from the Norwegian twin panel, a population-based register of like-sexed twins born in Norway between 1915 and 1961 and presently resident there, were asked, by mailed questionnaire, to report the duration of their own education (I, 0-7 yr; II, 8-9 yr; III, 10-12 yr; IV, over 12 years ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/314734a0
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  • 4
    Electronic Resource
    Electronic Resource
    Insignificance of Evidence for Differences in Heritability of IQ between Races and Social Classes (1972)
    [s.l.] : Nature Publishing Group
    Nature 240 (1972), S. 84-88 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Evidence previously analysed is insufficient to support the conclusions ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/240084a0
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  • 5
    Electronic Resource
    Electronic Resource
    Genetics and the development of social attitudes (1974)
    [s.l.] : Nature Publishing Group
    Nature 249 (1974), S. 288-289 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] We consider the causes of trait covariation within and between pairs of monozygotic (MZ) and dizygotic (DZ) twins. From'the responses of 708 volunteer pairs of like-sexed twins to an 80-item Personality Inventory and to a 60-item Public Opinion Inventory, scores were derived on scales of ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/249288a0
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  • 6
    Electronic Resource
    Electronic Resource
    Is there only one set of genes for different abilities? A reanalysis of the National Merit Scholarship Qualifying Test (NMSQT) data (1984)
    Springer
    Behavior genetics 14 (1984), S. 355-370 
    Details
    ISSN: 1573-3297
    Keywords: multivariate genetical analysis ; educational achievement ; twins ; covariance structure ; specific abilities
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Psychology
    Notes: Abstract Using the genetical analysis of covariance structure it is shown that the single factor model of Plomin and DeFries [(1979).Behav. Genet. 9:505–517] fails as a description of the structure of genetic covariation between the subtests of the National Merit Scholarship Qualifying Test. A genetic group factor which loads on Vocabulary, Social Studies, and English greatly improves the fit of the model. There is also a large portion of genetic variance specific to Mathematics and it is argued that the genetic variance for different abilities is far from homogeneous in its origin. The data suggest that a single dimension of mate selection or cultural inheritance accounts for a significant part of the phenotypic covariance between measures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01080047
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  • 7
    Electronic Resource
    Electronic Resource
    A note on the generalized effects of assortative mating (1984)
    Springer
    Behavior genetics 14 (1984), S. 371-376 
    Details
    ISSN: 1573-3297
    Keywords: assortative mating ; cultural inheritance ; trait correlation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Psychology
    Notes: Abstract Several twin studies of multiple abilities and educational and socioeconomic variables suggest that a single common factor underlies the contribution of mate selection and cultural inheritance to the covariation of such measures. Theoretical analysis shows that this finding is consistent with a mechanism of mate selection in which specific abilities are merely components of a composite latent variable for which there is assortative mating. We question how far measures of specific abilities reflect behavioral traits of independent adaptive significance.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01080048
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  • 8
    Electronic Resource
    Electronic Resource
    No decline in assortative mating for educational level (1985)
    Springer
    Behavior genetics 15 (1985), S. 349-369 
    Details
    ISSN: 1573-3297
    Keywords: assortative mating ; education ; no secular changes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Psychology
    Notes: Abstract Education data from the Norwegian twin panel reveal no decline in the marital correlation for educational attainment for the past 35 years. Comparable marital correlations are found for British and American samples. A higher marital correlation is obtained for the parents of the Norwegian twins and the parents of their spouses, but this is an artifact. A twin's recall of his/her parents' educational levels is shown, by model fitting, to be biased by his/her own education level. Allowing for this bias reduces our estimate of the parental marital correlation and reduces estimates of the broad heritability of educational attainment from 74–81 to 49–58%. Other, unrelated factors may also be biasing estimates of the similarity of their parents' educational levels by the twins and their spouses.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01070894
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  • 9
    Electronic Resource
    Electronic Resource
    The resolution of cultural and biological inheritance: Informativeness of different relationships (1985)
    Springer
    Behavior genetics 15 (1985), S. 439-465 
    Details
    ISSN: 1573-3297
    Keywords: Genetic ; cultural ; designs ; twins ; adopteds
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Psychology
    Notes: Abstract The informativeness of different relationships for resolving the genetic and cultural transmission of a continuous variable is explored by computer simulation. Extended twin, extended nuclear-family, and adoption designs are considered. Combining data on twin and parent-offspring pairs provides a powerful means of detecting genetic and cultural transmission. The addition of uncle-nephew and first-cousin data sometimes leads to an increase in power. Designs involving monozygotic twin pairs and their offspring are weaker. The most powerful adoption designs involve data on both biological parent-adopted-away offspring and adoptive parent-adopted offspring pairs. In the absence of information about biological parents, combining nuclear-family, adoptive parent-adopted offspring, and adoptive/natural sibling relationships still provides a powerful strategy for hypothesis testing. Adoption designs are more robust than extended twin and extended nuclear-family designs for resolving cultural and biological inheritance in the presence of genetic dominance or phenotypic assortative mating.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01066238
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  • 10
    Electronic Resource
    Electronic Resource
    A theory of developmental change in quantitative phenotypes applied to cognitive development (1986)
    Springer
    Behavior genetics 16 (1986), S. 143-162 
    Details
    ISSN: 1573-3297
    Keywords: development ; aging ; path analysis ; heritability ; family resemblance ; quantitative inheritance ; cognition ; twins
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Psychology
    Notes: Abstract A model is presented for the changes in familial resemblance as a function of age. The model allows for separate developmental components of genetic and environmental effects and for the influence of earlier phenotypic values on current measurements. Genetic and environmental effects may be specific to occasions or constant over time. Expected covariances are derived within individuals and between relatives measured at different ages. Parameter substitution shows that models with different assumptions about the mechanism of development yield different predictions for temporal changes in family resemblance. The application of the model is illustrated by the analysis of published longitudinal data on cognitive development. The data suggest that the continuity of cognitive performance over time and the increase in heritability with age reflect the cumulative long-term effects of a single set of genes expressed throughout development. The quality of the shared environment changes from family to family over time but appears to exercise a long-term effect on cognitive development.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01065484
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