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We may get our genes from our ancestors, but society all together has been gaining weight, there is the affect of society around us and not all from the genes we inherit

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E.g. Raising boys in barrels, lower intelligence, when environments become more similar, heredity as a source of differences necessarily becomes more important.

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Heritability refers instead to the extent to which differences among people are attributable to genes

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You inherit 50% intelligence - however, this does not mean that your intelligence is 50% inherited

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The nature provides the blueprints of outcomes and nurture decided the outcomes, ex. Eating disorders, genetically influenced, but more common in Western Civilizations

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If intense in preschool then typically will be intense still when they are adults, and sometimes if emotionally reactive around three the child can become aggressive when they become adults

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If fearful around 2 years old then around 8 they will be shy

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When four months old, if child cries and pump legs a lot they will most likely be fearful when they are two years old, however if they are happy and smile a lot they will outgoing and fearless when they are two years old

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If the child is emotionally reactive when they are first born they will be emotionally reactive around 9 months

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The portion of variation among the individuals that we can attribute to genes. The heritability of a trait may vary, depending on the range of populations and environments studied.

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A person's characteristic emotional activity and intensity