Origins studies

Family studies
1. diffs between relatives in their genetic similarities
  1. family members share environments
    1. difficult to seperate effects of genes from those of shared environment
Adoption studies
1. adopted children compared with biological & adoptive parents
  1. similarity between bio parent used to assess contribution of genes
    1. similarity between child & adoptive parent to assess contribution of environment
Twin studies
1. concordance for particular characteristics between MZ & DZ twins
  1. MZ share 100% genes, MZ about 50%
    1. if gene important MZ twins should show greater concordance than DZ
      1. Reitveld et al- 75% heritability for over activity & attention problems
        correlation analysis of concordance rates
        Rates for schizophrenia 4x higher for MZ than DZ suggesting even complex mental disorders highly heritable
        heritability is % of observed diffs within a particular population at a particular time which can be explained by genetic diffs
        heritability refers to groups not individuals
        does not say the extent to which a particular characteristic may be modifiable
        it changes across lifespan, correlations for cog ability between parents & kids increase as child ages

Zusammenfassung der Ressource

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