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The winding roads to adulthood: A twin study.

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Genetic and environmental factors significantly influence emerging adulthood traits, impacting mental health, wellbeing, and education. Despite environmental influences, genetics play a substantial role in shaping individual differences during this life stage.

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Area of Science:

  • Behavioral Genetics
  • Developmental Psychology
  • Psychometrics

Background:

  • Emerging adulthood is a critical developmental period characterized by significant life choices and transitions.
  • Understanding the interplay of genetic and environmental factors is crucial for explaining individual differences in psychological traits during this phase.
  • Previous research has explored various aspects of emerging adulthood, but a comprehensive investigation of genetic and environmental influences across a wide range of traits is lacking.

Purpose of the Study:

  • To systematically investigate the genetic and environmental influences on 57 psychological traits relevant to emerging adulthood.
  • To examine the associations between these emerging adulthood traits and key outcomes such as mental health, wellbeing, physical health, and educational attainment.
  • To determine the extent to which genetic and environmental factors explain the observed correlations between emerging adulthood traits and outcomes.

Main Methods:

  • Utilized data from nearly 5000 pairs of UK twins aged 21-25 from the Twins Early Development Study.
  • Assessed 57 measures of psychological traits encompassing aspirations, attitudes, relationships, personality, and behaviors specific to emerging adulthood.
  • Included measures of adverse mental health, wellbeing, physical health, and educational attainment as outcome variables.

Main Results:

  • All 57 traits exhibited significant genetic influence, with an average heritability of 34% (SNP heritability ~10%).
  • Non-shared environmental influences explained the majority of the variance (59% on average).
  • Emerging adulthood traits were associated with mental health (r=0.20), wellbeing (r=0.16), physical health (r=0.12), and education (r=0.06), with shared genetics explaining about 50% of these correlations.

Conclusions:

  • While non-shared environmental factors are primary drivers of individual differences in emerging adulthood traits, genetic influences remain substantial.
  • Genetic predispositions significantly shape the developmental trajectories and outcomes experienced during emerging adulthood.
  • The environmental uncertainties of emerging adulthood do not negate the profound and lasting impact of genetic factors on individual development.