An individual who has two different forms of a particular gene, one inherited from each parent. A heterozygote for cystic fibrosis (CF) has the CF gene on one chromosome 7 and the normal paired gene on the other chromosome 7. Also known as carrier.

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  • Heterozygous

    Possessing two different forms of a particular gene, one inherited from each parent.

  • Hexadactyly

    on either side of the extremity or somewhere in between. With the hand for example, the extra finger can be out beyond the little finger (which is called ulnar hexadactyly) or out beyond the thumb (radial hexadacyly) or, finally, between two of the normally expected fingers (intercalary hexadactyly). Far and away the most frequent form […]

  • Hg

    Symbol for the metallic element mercury. The abbreviation “mm Hg” means millimeters of mercury, the height of a column of mercury, as in a blood pressure reading. Mercury is poisonous to people. See Mercury poisoning.

  • HGD

    The gene encoding an enzyme called homogentisate 1,2-dioxygenase (also known as homogentisate oxidase). HGD is located on chromosome 3 in region 3q21-q23. Homogentisate oxidase is active chiefly in the liver and kidneys. It is needed to break down the amino acids phenylalanine and tyrosine. Previous steps convert these two amino acids into a molecule called […]

  • HHS

    The Department of Health and Human Services of the US government, which has jurisdiction over public health, welfare, and civil rights issues and is the highest-level US government body with such jurisdiction. Agencies under HHS include the Food and Drug Administration (FDA) and the National Institutes of Health (NIH).

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