“…Behavioral genetics work focusing on reading comprehension has indicated both significant genetic and environmental factors. Estimates of heritability have been small to large, ranging from .32 to .82 (Betjemann, Keenan, Olson, & DeFries, 2011; Betjemann et al, 2008; Hart, Petrill, & Kamp Dush, 2010; Keenan, Betjemann, Wadsworth, DeFries, & Olson, 2006; Logan et al, 2013; Petrill, Deater-Deckard, Schatschneider, & Davis, 2007). Additionally, there are low to moderate shared environmental influences on reading comprehension, ranging from .01 to .47 (Betjemann et al, 2008; Logan et al, 2013; Petrill et al, 2007), and low to moderate non-shared environmental influences, ranging from .13 to .31 (Betjemann et al, 2011; Byrne et al, 2009; Keenan et al, 2006).…”