Behavior genetic theory identifies the amount of genetic overlap between two individuals and hypothesizes that two people who share more genes will be more similar to one another compared to others who share less genes.

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Behavior genetic theory indeed posits that individuals who share a greater number of genes, such as siblings or twins, are likely to exhibit more similarities in their behaviors, characteristics, and even in some aspects of their environment, compared to those who share fewer genetic materials, like distant relatives or unrelated individuals. This is based on the understanding that genetics play a significant role in influencing behavior and traits.

Behavior Genetic Theory Identifies the Amount of Genetic Overlap Between