Figure 6.

The distribution of R² for the regression Y_ij = μ + C_i + T_i + C_i × T_i, where Y is $\widehat{\theta },$ C_i is the estimate of cis, and T_i is trans for line i for each exon j. R² is an estimate of the contribution of cis-interactions, trans-interactions, and cis- by trans-interactions to AI. Distributions of R² are similar in the mated and virgin environments. Cis-effects explain at least 45% of the variation in expression for 75% of exons tested. Trans-effects explain 8% of the variance on average. The cis- by trans-interaction explains an additional 11% of the variance on average.