> tests conducted by Oxitec prior to the experiment suggested that around 3 to 4 percent of F1 offspring would survive into adulthood, but it was presumed these lingering mosquitoes would be too weak to reproduce, rendering them infertile. These predictions, as the new research shows, were wrong … portions of the genome from the transgenic strain had “incorporated into the target population,” ... anywhere from 10 to 60 percent of mosquitoes analyzed featured genomes tainted by OX513A … the Oxitec scheme worked at first, resulting in a dramatic reduction in the size of the mosquito population. But at the 18-month mark, the population began to recover, returning to nearly pre-release levels. According to the paper, this was on account of a phenomenon known as “mating discrimination,” in which females of the native species began to avoid mating with modified males.