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1

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.
2

The ability of scientists to produce genetically engineered raises new possibilities of correcting genetic flaws, not only in animals but also in humans, and it accelerates the pace of developments in the new field of gene therapy.
3

At 16 to 18 weeks, the major organs begin functioning, although the could not be kept alive outside the mother.
4

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 .
5

, a condition resulting in mental and growth retardation, has been found in the children of mothers who consumed heavy or sometimes even moderate amounts of alcohol during pregnancy.







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