| Term | Definition |
| Recombination | The result of crossing over that ensures genetic diversity |
| Nondisjunction | When homologous pairs or sister chromatids do not separate properly in meiosis |
| Polyploidy | The nondisjunction of all chromosomes, resulting in multiple sets of chromosomes |
| Chromosomal Mutations | Can occur during meiosis, during crossing over (in prophase I) |
| Deletion | When a piece of chromosome is lost |
| Duplication | When a piece of chromosome remains attached when it shouldn't, one carries both alleles |
| Inversion | When a piece of chromosome reattaches in reverse direction |
| Translocation | When a piece of chromosome ends up on a non-homologous chromosome |
| Gene Rearrangement | When a gene is moved to a new location |
| Nonsense Mutation | Codes for a stop where there shouldn't be one |
| Frameshift Mutation | An insertion or deletion that shifts the reading frame |
| Missense Mutation | Results in a different amino acid |
| Silent Mutation | Has no effect on genetic function |
| Point Mutation | A change of a single nucleotide by insertion or deletion |
| Mutagen | A cause of a mutation |
| Mutant | An individual whose DNA or chromosomes differ |
| Mutation | A change in genetic material in an organism |