Abstract

We examined the extent to which genes and the environment contributed to variation in and covariation among reading, spelling, grammar and punctuation, writing, and numeracy in Australian school children in Grades 3, 5, 7, and 9. Heritability was generally high: reading .58-.71 (excepting Grade 5 girls), spelling .68-.78; grammar and punctuation .52-.66, writing .39-.52, and numeracy .39-.79. Boys' performance varied more than girls in spelling and numeracy, and the common environment was a greater influence in girls than boys in Grade 3 numeracy and Grade 5 reading. Independent pathway models showed similar genetic and environmental structures at each grade with approximately one third to one half of the variation in each domain due to genes that influenced all domains. The covariation among the domains was largely mediated by genes. Results suggest substantial uniformity in the environmental factors influencing these academic domains.

Authors	Grasby, Katrina L.; Coventry, William L.; Byrne, Brian; Olson, Richard K.; Medland, Sarah E.
Journal	BEHAVIOR GENETICS
Pages	627-648
Volume	46
Date	1/09/2016
Grant ID	DP120102414
Funding Body	Australian Research Council
URL	http://www.ncbi.nlm.nih.gov/pubmed/?term=10.1007/s10519-016-9797-z