Gait. Manner of walking.

Gastroenterologist. A doctor focusing on the function and disorders of the stomach, intestines and assorted organs that are often referred to as the GI tract.

Gene. A functional unit of heredity (like eye and hair color, height, among many other characteristics including inherited diseases) that occupies a specific place on a chromosome; it is capable of reproducing itself at each cell division and directs the formation of an enzyme or protein.

Genetic. Of or pertaining to genes; inherited.

Genetic counseling. A meeting with a medical professional, often a geneticist, to learn how a possible inherited disease can affect you, and how you can choose to avoid passing it to your offspring if you so choose.

Genomic background. Referring to the complete set of genes inherited from one's parents.

Genotypes. The sum total of the genetic material transmitted from a person's parents.

GI tract. Bodily system referrring to the stomach, intestines and related organs.

Gonadal (or testicular) atrophy in men. A medical condition in which the male reproductive organs (the testes) diminish in size and fail to function.

G-Tube. Implanted feeding tube to supply sustenance when person is unable to safely swallow on his own impotence.