Dr. kellman finds a near-zero correlation between identical twins' scores on a measure of a personality trait. Dr. kellman will probably attribute variability in the trait to: non shared environmental factors.
People's distinctive thought, feeling, and behaviour patterns are reflected in their personality traits. A person who scores highly on a certain personality trait, such as Extraversion, is likely to be gregarious in various contexts and over time. Personality traits imply consistency and stability.
Due to the fact that "identical" or monozygotic (MZ) twins share nearly all of their genes, the majority of variations between the twins (such as height, sensitivity to boredom, IQ, etc.) can be studied via the lens of environmental effect and varied genetic composition.
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