Have you ever noticed domestic pot of a plant eg chrism as tree even after a short while down side triggers a hormone threshold that tell s the plant system to grow against geo magnetism as its the straight in gene language of this plant and others as well. Similarly zero geo magnetism triggers the somatic union of chromosome s that are hitherto simply incompatible to grow or pair together etc. Its broad way of understanding but actual process is complex as it involves isolation of nucleotide s to combine etc to further make a sustainable sequence as in big trees there are huge number of chromosomes that also can be studied in space to know their gene behaviour and copy it in gene cloning etc.