The mutations found in the HD allele result in a protein that has normal activity. The pattern of inheritance of Huntington disease indicates that the HD disease allele is to the normal (HD") allele. If a mother is heterozygous for the normal and disease- causing HD alleles and a father is homozygous for the normal allele, it is all their children will have Huntington disease. Offspring of individuals that have only one parent with the mutant HD allele have a chance of having Huntington disease.

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A:

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Hematology

Hematology is the branch of biology. Hematology is the medical field that deals with the treatment of blood disorders and cancers, such as hemophilia, leukemia, lymphoma, and sickle-cell anemia. Hematologists and hematopathologists are medical professionals who specialize in illnesses of the blood and its components.