Table 2.

Expression types for all genes in the study

Type	Interpretation	Count
Untested	Few transcripts present in any sample	19,391
Low-expression	Expression was too low to classify, but clearly present	8,488
E-only	Environmental response; gene expression levels change over the time-course, but there were no genotypic differences	9,208
E-ambiguous	Expression levels change over the time-course; genotypic differences may be present but minor.	3,619
G-only	No environmental response, but a constant genotypic difference across time-points	75
GxE	A substantial genotypic difference between two time-points; genotype is conditioning environmental response	542
G + E	An environmental response and a constant genotypic difference across time-points	84
G + E- ambiguous	Response is either a GxE or G + E, but difficult to specify which.	1,437
Constant	Expression was constant between genotypes and across time-points	7,290
Ambiguous	Expression was too erratic across replicates to classify.	3,511
Total		53,645