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| every non-genetic influence, from prenatal nutrition to the people and things around us |
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| the study of the relative power and limits of genetic and environmental influences on behavior |
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| threadlike structures made of DNA molecules that contain the genes |
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| a complex molecule containing the genetic information that makes up the chromosomes |
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| the biochemical units of heredity that make up the chromosomes; a segment of DNA capable of synthesizing a protein |
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| the complete instructions for making an organism, consisting of all the genetic material in that organism's chromosomes |
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| twins who develop from a single fertilized egg that splits in two, creating two genetically identical organisms |
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| twins who develop from separate fertilized eggs. They are genetically no closer than brothers and sisters, but they share a fetal environment |
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| a person's characteristic emotional reactivity and intensity |
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| the proportion of variation among individuals that we can attribute to genes. |
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| in psychology, occurs when the effect of one factor (such as environment) depends on another factor (such as heredity) |
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| the sub-field of biology that studies the molecular structure and function of genes |
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| the study of the evolution of behavior and the mind, using principles of natural selection |
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| the principle that, among the range of inherited trait variations, those that lead to increased reproduction and survival will most likely be passed on to succeeding generations |
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| a random error in gene replication that leads to a change |
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| in psychology, the biologically and socially influenced characteristics by which people define male and female |
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