Medical Definition of Biallelic

  • Medical Author:
    William C. Shiel Jr., MD, FACP, FACR

    Dr. Shiel received a Bachelor of Science degree with honors from the University of Notre Dame. There he was involved in research in radiation biology and received the Huisking Scholarship. After graduating from St. Louis University School of Medicine, he completed his Internal Medicine residency and Rheumatology fellowship at the University of California, Irvine. He is board-certified in Internal Medicine and Rheumatology.

Biallelic: Pertaining to both alleles (both alternative forms of a gene). For example, biallelic mutations in the gene MYH predispose to colon cancer.

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Reviewed on 12/21/2018

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