gene drive

A gene drive is a genetic trick that breaks the normal rules of inheritance to push a chosen gene through a whole population. Usually each parent passes a given gene to only about half its offspring. A gene drive rigs the lottery so the gene is inherited by nearly all offspring, spreading fast across generations even if it gives no survival advantage.

Modern gene drives often use CRISPR. The drive carries the genes for Cas9 and a guide RNA. In an offspring that inherits the drive from one parent only, the Cas9 cuts the other parent's matching chromosome, and the cell repairs the break by copying the drive across — so an animal that should have been a carrier of one copy becomes a carrier of two, and passes the drive on at well above the usual rate.

Gene drives could, in principle, suppress disease-carrying mosquito populations or remove invasive pests. They are also genuinely powerful and hard to recall once released, can be slowed by resistance mutations, and raise serious ecological and governance questions — so research emphasizes containment, reversibility, and broad public deliberation before any field use.