Do Genetics or Environment Influence IQ More?
Genetics and Environment Influence on IQ
Owenâs biological parents adopted Ian. Owen and Ian have lived together for the first 18 years of their lives. Based on research, what is likely to be true about their IQ tests?
Final answer: Owen and Ian, who were raised together but are not biologically related, may display similarities in their IQ due to shared environmental influences, but genetics will also significantly impact their intelligence levels.
Explanation:
When considering the IQ tests of Owen and Ian, who are non-biological siblings reared in the same household, research suggests there may be a combination of genetic and environmental influences on their intelligence. The Minnesota Study of Twins Reared Apart demonstrates that genetics play a significant role, given that identical twins, whether raised together or apart, show higher IQ score correlations than siblings or fraternal twins. Nonetheless, environmental factors are also critical, as developmental stimulation can impact IQ levels. So, even though Owen and Ian are not biologically related, their shared environment for the first 18 years of their lives could have fostered similar intelligence levels, although their individual genetics also play a determinative role.