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Developmental Psychology
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The Branch of Psychology that studies patterns of growth and change that occur throughout life
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Nature-nurture issue
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The issue of the degree to which environment and heredity influence behavior
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Identical Twins
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Twins who are genetically identical
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Cross-sectional Research
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A Research Method that compares people of different ages at the same point in time
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Longitudinal Research
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A research method that investigates behavior as participants age
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Sequential Research
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A research method that combines cross-sectional and longitudinal research by considering a number of different age groups and examining them at several points in time
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Chromosomes
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Rod-shaped structures that contain all basic hereditary information
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Genes
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The parts of the chromosomes through which genetic information is transmitted
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Zygote
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The new cell formed by the union of an egg and sperm
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Embryo
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A developed zygote that has a heart, a brain, and other organs
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Fetus
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A developed individual, from eight weeks after conception til birth
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Age of viability
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The point at which a fetus can survive if born prematurely
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Teratogens
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Environmental agents such as a drug, chemical, virus, or other factor that produce a birth defect
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Neonate
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A newborn Child
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Reflexes
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Unlearned, involuntary responses that occur automatically in the presence of certain stimuli
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