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Hey everyone.
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In this lesson, we'll analyze a statement by applying structural modeling techniques to the variances and co -viances associated with various family constellations.
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It is possible to decompose phenotypic trait variants into separate sources with genetic and environmental variants.
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So this statement describes a key premise in behavior of genetics, specifically the use of structural equation modeling, also known as sem and twin adoption studies.
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To estimate the contribution of genes, heritability, and environment to individual differences and traits.
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However, while this approach is widely used, it presents theoretical and methodological challenges.
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So, let's get started.
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Understanding structural modeling and behavioral genetics.
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Structural modeling, such as twin studies, adoption studies, and family.
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Family -based analysis aimed to partition phenotypic variants into three key components.
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There is genetic variants, which is the proportion of trade variation explained by inherited genetic factors, shared environmental variants, environmental influences that make family members more similar, socioeconomic status, parenting style, and non -shared.
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Environmental variance.
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So unique environmental factors that contribute to individual differences within the same family, such as peer -influenced random life events, will be under this category.
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So the statistical method assumes that observe correlations between relatives, twins ' parents ' parents ' offspring reflect underlying genetic and environmental influences.
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Why this premise is fundamental to causal theories of individual differences.
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So behavioral genetic studies seek to identify the causes of individual differences in traits like intelligence, personality, mental health, and behavior.
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If genetic variance is high, researchers may infer a strong biological influence.
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If environmental variance is high, interventions may be considered more effective in shaping behavior...