| Term | Definition |
| genealogy | history of the descent of a person or family from an ancestor |
| genealogical | ancestral |
| genesis | origin |
| heterogeneous | differing in kind, dissimilar |
| homogeneous | of the same kind, similar |
| homogenize | make homogeneous |
| genocide | extermination of a race of people |
| genre | a kind or type, as in literature or art |
| genome | one complete set of chromosomes |
| genetics | the branch of biology dealing with hereditary |
| geneticist | a specialist in genetics |
| genus | a classification of plants and animals |
| genotype | the type species of a genus |
| genius | a great mental capacity |
| ingenuous | naive, simple |
| disingenuous | not candid or frank, insincere |
| genial | friendly, amiable |
| congeniality | going together well |
| generate | to produce offspring |
| generic | universal |