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  • Gender: male or female.
  • Gene locus: the specific place on a chromosome where a specific gene is located.
  • Gene mutation: a permanent change in a gene that can be passed on to offspring.
  • Gene(s): a specific sequence of nucleotides in DNA that is located on a chromosome and that determines the expression of one or more traits by specifying the production of a specific protein in the cell.
  • Generic drug: the official chemical name of a drug. There is only one generic name for each drug. Although many companies may make the same drug, each one will provide its own trade name for their drug.  It is often important to know the correct generic name for a drug as the trade name is not always used on drug lists.
  • Genetic: caused by or controlled by genes.
  • Genetic code: sequence of nucleotides in DNA and RNA that determines the amino acid sequence of proteins.
  • Genetic predisposition: the inherited genetic pattern which may make you more susceptible to certain diseases or conditions.
  • Genetics: the study of the biological heredity or inheritance.
  • Genotype: determines the genetic information contained in an individual. Usually refers to determining whether a particular mutation is present or absent. Literally, the "type of gene" present.
  • Globin: is the protein portion of hemoglobin.
  • Glucose: an important carbohydrate that serves as a major source of energy in the body.  A special glucose solution is often given intravenously to alleviate acute porphyria attacks as well as dehydration and shock.
  • Glycine: one of twenty amino acids. It participates in the first step of heme biosynthesis.
  • Gonadotropin-releasing hormone (GnRH) analogue: a specific type of synthetic hormone used to control a woman’s menstrual cycle.