Figure 1. Crossing scheme to create an MLA mosquito strain.
A: Each transgenic line (A–D) is outcrossed to one of two wild-type backgrounds (denoted by colors). The final 8 outcrossed transgenic lines are made homozygous. B: The 8 outcrossed transgenic lines are specifically crossed and offspring of the correct genotype selected each generation to construct the MLA strain. Correct genotyping of offspring can potentially be automated in a high-throughput manner (see text and Figure 8). C: Hypothetical locations of each transgenic locus so that all 4 loci assort independently.