Biology

Gammaproteobacteria

Ganglion

Ganglion (nervous system): structure, types, and functions

Gas exchange

Gas exchange in organisms

Gastralia

Gastralia (belly ribs): ventral dermal bones in reptiles

Gastralia, or belly ribs, are dermal bones in the ventral body wall of some reptiles and fossil taxa. They support the abdomen, may assist breathing, and inform reconstructions of

Gastrulation

Gel electrophoresis

Gel electrophoresis: principles, types, and applications

Gene

Gene: units of heredity — structure, function, and significance

Gene duplication

Gene expression

Gene expression: how genetic information produces functional molecules

Gene family

Gene family: definition, origins, structure, and biological roles

Gene flow

Gene flow: movement of genes and alleles between populations

Gene knockout

Gene knockout: methods, applications, and distinctions

Gene pool

Gene pool — definition, dynamics, and biological significance

Gene silencing

Gene targeting

Genetic code

Genetic code: how nucleotide sequences specify proteins

The genetic code is the set of rules by which nucleotide triplets (codons) in DNA or mRNA specify amino acids during protein synthesis. It is largely universal, degenerate, and cen

Genetic drift

Genetic engineering

Genetically modified organism

Genetics

Genome

Genome: definition, structure, history, and applications

Genome editing

Genomics

Genomics: study of genomes, methods, history, and applications

Genotype

Genotype: genetic constitution and its relationship to phenotype

Genus

Germ

Germ theory of disease

Gerontology

Gestation

Gestation: biology, variation, and significance in viviparous animals

Giant Gippsland earthworm

Giant Gippsland earthworm (Megascolides australis)

Giant tube worm

Giant tube worm (Riftia pachyptila)

Giardia lamblia

Gill

Gizzard

Gizzard (gastric mill): structure, function, and occurrence in animals

Gland

Gland (biology): types, structure, and roles in organisms

Glial cell

Glires

Glires: the clade uniting rodents and lagomorphs

Globular protein

Glow-worm

Glow-worm — bioluminescent insects and their biology

Glycogen

Glycogen: animal storage polysaccharide and rapid glucose reserve

Glycolysis

Glycolysis: the central glucose breakdown pathway

Glycoprotein

Gnathostomata

Gnathostomata — jawed vertebrates (sharks, bony fish and tetrapods)

Gnathostomulida

Golden algae

Golden algae (Chrysophyceae): biology, ecology and notable species

Golgi complex

Gonadotropin

Gonadotropins: LH, FSH and related reproductive hormones

Gonadotropin-releasing hormone

Gonadotropin-releasing hormone (GnRH): role, regulation, and clinical relevance