Genetic Terms
A gene is the functional
and physical unit of heredity passed from parent
to offspring. Genes are pieces of DNA, and most
genes contain the information for making a specific
protein.
Genetics is a term
that refers to the study of genes and their role
in inheritance—the way certain traits or conditions
are passed down from one generation to another.
Genomics is a relatively
new term that describes the study of all of a person's
genes including interactions of those genes with
each other and the person's environment.
A genetic disorder
is a disease caused in whole or in part by a "variation"
(a different form) or "mutation" (alteration) of
a gene. We are learning that nearly all diseases
have a genetic component.
Some diseases, including many cancers, are caused
by a mutation in a gene or group of genes in the
cells of an individual. Such mutations can occur
randomly or due to some environmental exposure (such
as cigarette smoke).
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