X-linked genetic conditions are genetic diseases affecting the sex chromosomes X and Y. They are called "x-linked" or "sex-linked" genetic conditions. (For comparison, non-sex chromosomes 1..22 are called "autosomes" and the resulting conditions called autosomal genetic diseases.)
Dominant genetic diseases only require a single copy of the gene to be damaged. This error need only be inherited from one parent in order to get the disease. The bad gene from one parent dominates the other parent's good gene. There is no such thing as a "carrier" of a dominant disease because everyone who has the genetic error gets the disease.
See also articles Introduction to Genetics and Introduction to Genetic Diseases.
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Book excerpts: Copyright © 2008 Lippincott Williams & Wilkins. All rights reserved.
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