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Environment
Family resemblance is also shaped by environmental factors; temperature, light, nutrition, exposure to drugs, and the time that different family members spend in shared and non-shared environments are examples of factors are examples of factors found to influence phenotype. Phenotypes found to be largely environmentally determined in humans, include personality, height , and weight. Twin studies have shown that more than half of the variation in a few major aspects of personality are environmentally determined, and that environmental factors even affect traits like immune response and how children handle stress. Additionally, anomalous findings, such as second-degree relatives of alcoholics showing surprising similarities to them have lead some researchers to attempt to generate better models that account for the environmental impacts on influences like cultural inheritance, such as family structure and head of household, which have been shown to influence family resemblance.