Evidence has shown that high IQ heritability and IQ scores are closely correlated with academic performance, as well as occupation, health and income. Numerous studies find that the heritability of intelligence rises from about 20% in infancy to as much as 80% in adulthood. This means that majority of IQ differences between adults can be attributed to inheritance.
This effect may also be increased by the tendency of men and women to choose partners who are similar to themselves. Correlations between married couples are greater for intelligence than they are even for personality or height and weight, an effect that increases heritability.
Thus, a person's success will depend not only on one's upbringing, education, friends, health and other factors but heredity plays a large part as well.
SB (March, 2016) "Q&A: Are academic traits genetic?" BBC Knowledge volume 8 (issue 3), 92.
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