Figure 1.

Genetics. Engineered males carry two copies of a genetic construct ‘L’, which is a repressible dominant lethal. The wild‐type allele ‘w’ represents the absence of the engineered construct. All offspring of released males and wild females inherit one copy of the dominant lethal. In (A), those progeny are not viable. In (B), the engineered lethality is female‐specific; thus, female progeny are nonviable and male progeny survive and can pass on the construct to half of their own offspring.