Don't worry, that's definitely above high school biology level. Here's the most readable article I could find: https://www.ncbi.nlm.nih.gov/books/NBK21254/ htt

Don't worry, that's definitely above high school biology level. Here's the most readable article I could find: https://www.ncbi.nlm.nih.gov/books/NBK21254/ https://www.ncbi.nlm.nih.gov/books/NBK21254/ In summary (me: CS background, biology family), there are self-mobile genetic sequences (in that they themselves encode the molecular machinery necessary to move their string of DNA to a different location in the genome) in some fruit fly populations. Additionally, the implementation of this also gives rise to a phenomenon called hybrid dysgenesis whereby the sexed cross of one type (female without, male with) causes rampant mutations in offspring. Whereas the oppositely sexed cross (female with, male without) has much of the P activity suppressed and therefore able to live. Presumably this terrifies parent poster because one could hypothetically create a situation where only a population with the genetic secret contained in their females would be able to successfully reproduce.