Gene drive is a natural process and a tool used in genetic engineering that spreads a specific set of genes throughout a population of organisms. While normally, the chance of inheriting a specific gene from your mother or father is 50%, gene drives increase the likelihood of inheritance, increasing the density of alleles in a family over generations. Geneticists like Dr. George Church, believe gene drives could be used to eliminate pathogens carried by insects, such as malaria, which is carried by a small number of mosquito species, or Lyme disease, which is carried by deer ticks. While this could transform public health, there may be consequences to altering ecosystems in this way. In this clip, Dr. George Church discusses the opportunities and possible dangers of tools for genetic engineering.