| Term | Definition |
| Genetic Anticipation | a phenomenom where the onset of symptoms of a hereditary disease appears to occur at a progressively earlier age in successive generations |
| Insterspered sequences | sequencing that differ from that of the expanded triplet repeat that have stabalizing effects |
| Fragile X Syndrome | most common cause of inherited mental retardation in males |
| FMR1 | Fragile X Syndrome Mutated Gene |
| FMRP | Fragile X Mutated Protein that is though to be involved in translation |
| Huntington's | dominantly inherited progressive brain disorder results in mental and physical degeneration |
| Uniparental Disomy | arises when a child inherits two copes of a chromosome from one parent and none from other |
| trisomy rescue | occurs when a chromosome is lost restoring the trisomy to the normal disomy state |
| heterodisomy | inheritance of two homologous chromosomes from one parent |
| uniparental isodisomy | duplication of one parental chromsome resulting in two identical chromosomes |
| epigenetic | trait affects gene expressing that is heritable through cell divisions |
| Genomic imprinting | results in monoallelic expression despite biallelic transmission |