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  • Minnesota Twin Study
    1,572 words
    Behavioral genetics is a field of research that investigates the relative effects of heredity and environment on behavior and ability (Plomin, 1997). Two of the primary methods used by behavioral geneticists are the twin study method, first used by Galton (1975) in his studies of heredity, and the adoption method. In the twin study method, researchers studies identical twins (monozygotic twins) and fraternal twins (dizygotic twins) to determine how much they resemble each other on a variety of c...
  • Identical And Fraternal Twins
    1,151 words
    Today most interest in twins serves to determine whether traits come from ones environment or from genetics. However, throughout time, twins have been a constant source of entertainment and amazement for society. Twins differ very little, and according to an e-mail interview with Dr. Nancy Segal, the American attraction to them is due to our high value and appreciation of independency and personal differences. Segal believes the similarity of twins contrasts greatly with Americans values and thi...
  • Familial Studies Of Intelligence
    2,603 words
    Nature vs. Nurture The dubious history of the heredity environment controversy can be easily traced as far back as the start of the present century with at least some historical evidence placing the roots of this dispute in the time of John Locke. This controversy has continued despite continual reiteration that the critical question is not how much of a trait is due to heredity and how much is due to environment, but rather how environment transact to influence development". (Wa chs, 1983, p. 3...
  • New Twin Studies Show
    1,690 words
    Growing Up The nature versus nurture debate has been a classic controversy among experts for centuries. Presently, there is no clear conclusion to the dispute; yet, there are many hypotheses. Both sides of this controversy have been explored thoroughly among researchers. The nature side of the debate argues that a person maintains his mental ability only based on what he is born with genetically. Defending this side of the debate exclusively would be establishing that a person's environment play...
  • Iq Of Biological Children And Their Parents
    766 words
    Intelligence What are the influences of environment and heredity on measured intelligence? HEREDITY Psychologists are greatly divided over whether heredity or environment has a more dominant influence on individual intelligence. Although some animal studies appear to suggest heredity have the greatest influence, a seemingly more accurate conclusion may be drawn form human studies on intelligence. In studies on the similarities between IQ of siblings reared in the same and separate environments, ...
  • Natures Clones And The Minnesota Twin Studies
    1,608 words
    However, the researchers neglected to include into their research the effects of extra familial factors (friends, peers, teachers, etc.) on the cognitive skills of these children. If these factors were not overlooked, the research may have proven that the environment does indeed influence cognitive development. Without this research, as it stands now, it is concluded that the greatest influence on cognitive development is solely attributed to genetics. In light of this particular perspective, th...
  • Twin Studies Into Ms
    1,661 words
    Twinning in human pregnancies occurs either by the separation of a single fertilized egg, or by the fertilisation of two different eggs. In the case where twins result from a single egg, they will be genetically identical or monozygous. Those arising from different eggs are dizygous. Dizygous twins therefore include twin pairs consisting of one male and one female and all dizygous twins are no more genetically similar than any other two siblings. Cases where both twins in a pair suffer from the ...

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