What Are The Different Types Of Hereditary Diseases?


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The most common class of hereditary diseases are the Mendelian diseases
(since they follow the Mendelian patterns of inheritance), they're
classified into 3 types:

  • Dominant; where if one allele is defected, the symptoms of the disease manifest since it is dominant, e.g. Marfan syndrome

  • Recessive; where both alleles need to be defected for the disease to manifest, e.g. Phenylketonuria

  • Sex-linked; where the allele is present on the X chromosome,
    but not on the Y chromosome, making males more susceptible to have the
    disease, e.g. Color blindness.
Alleles are copies of the same gene present on each of a
pair of chromosomes, one allele comes from the mother and one comes
from the father.

However, recently, most hereditary diseases are classified according to
the type of protein involved, whether structural, enzymatic, transport
protein, ...etc.

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