Once we know this, we will be one step closer to discovering just how big of a role genetic variance plays in the heritability of intelligence. Many sources suggest that the heritability ranges from about 40% in childhood to about 80% in adults (Gosso et al. 2006; Dick et al. 2007; Posthuma and E.J.C Geus, 2006). Although this phenomenon is not yet fully understood, it is believed that this increase over a person’s lifetime is due to both the development of the brain (and thus the expression of new genes) as well as a correlation between genotype and environment (Haworth et al. 2010). Currently research has shown that the heritability of intelligence appears to have connections to specific DNA markers, as well as associations and links to certain genes. There are various methods and studies that have been used in order gather these findings which will be discussed in detail. They include genome-wide association studies, multivariate genetic analyses, and family, adoption, and twin
Once we know this, we will be one step closer to discovering just how big of a role genetic variance plays in the heritability of intelligence. Many sources suggest that the heritability ranges from about 40% in childhood to about 80% in adults (Gosso et al. 2006; Dick et al. 2007; Posthuma and E.J.C Geus, 2006). Although this phenomenon is not yet fully understood, it is believed that this increase over a person’s lifetime is due to both the development of the brain (and thus the expression of new genes) as well as a correlation between genotype and environment (Haworth et al. 2010). Currently research has shown that the heritability of intelligence appears to have connections to specific DNA markers, as well as associations and links to certain genes. There are various methods and studies that have been used in order gather these findings which will be discussed in detail. They include genome-wide association studies, multivariate genetic analyses, and family, adoption, and twin