- Galidia
- gallery forest
- gametes
- gametogenesis
- gamonts
- ganglion
- Gap coding
- gastrula
- gecko
- Gene family
- Gene flow
- Gene pool
- Genetic bottleneck
- Genetic drift
- genitalia
- genotype
- gisa
- glabrous
- gland
- glans
- glutinous
- glycerin
- gonads
- Gondwanaland
- gonosome
- Governors-General
- Grade
- granule
- granulocyte
- grassland
- gregarious
- grooming
- gular
- gutteral