“…Reading is learned through classroom instruction, but each child enters a learning environment as a unique individual who differs from her classmates on many factors, including prior learning experiences but also family genetic and environmental background. Genes and environment are important contributors to variation in reading skills in early learning stages (Christopher et al., ; Erbeli, Hart, & Taylor, ; Petrill, Deater‐Deckard, Thompson, De Thorne, & Schatschneider, ), and genes appear to explain increasing proportions of variance in reading comprehension as children age (Little, Haughbrook, & Hart, ). Indeed, genetic differences account for half the variance in reading comprehension in adolescence (Tosto et al., ).…”