Genes can be present but either switched on or switched off.
Circumstances can cause a gene to switch on.
Dreaming analogous to software. Dreaming redesigns the associations and linkages of genes, setting some on and some off, and linking and separating patterns. A subtle reorganization proceeds by the dreaming. If it strengthens, it becomes the new means of coping or dealing with the pressure which tested it. This is very close to Sheldrake's morphogenetic fields in that it forsees understanding a 'medium' where 'reside' the 'subtle' field or effects spoken of, which are present at the 'reception' of the 'outside' stimulus or pressure, and which either weaken and dissolve in favor of a tried and tested means, or which strengthen, and 'do the job' and become the new means at the organism's disposal.