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1

Developmental psychologists agree that genetic factors not only provide the for particular behaviors or traits to emerge, but also place on the emergence of such behavior or traits.
2

Some researchers, instead of concentrating on people with similar genetic backgrounds who are raised in different environments, may consider people raised in similar environments who have totally dissimilar genetic backgrounds. They study .
3

Longitudinal studies assess change in intellectual ability over time, unlike cross-sectional studies, which assess differences among .
4

Genes are at least partially responsible for a wide variety of personal characteristics, including cognitive abilities, personality traits, and psychological disorders, and most traits result from a combination of , which operate together with environmental influences.
5

At 16 to 18 weeks, the major organs begin functioning, although the could not be kept alive outside the mother.
6

Genetic factors are not the only causes of difficulties in fetal development. Environmental influences also affect the fetus. Some of the more profound consequences are brought about by teratogens, environmental agents such as .





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