In one study of intelligence, adopted and biological children reared by the same mother resembled her IQ to the same degree, whether or not they shared her genes.

Name: In one study of intelligence, adopted and biological children reared by the same mother resembled her IQ to the same degree, whether or not they shared her genes.
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The study suggests that environmental factors, such as being raised by the same mother, can have a significant impact on a child's IQ, regardless of genetic relation.

In One Study of Intelligence, Adopted and Biological Children Reared