This is a human hereditary disease that is caused by a dominant allele but does not show up in affected individuals until they are in middle age is huntington's disease.
Huntington's disease is a brain disease. The disease attacks the cell of the brain such that the brain stop's function in the affected area.
The disease can be hereditary because affect gene that are dominant and not recessive.
The disease does not show immediately in affected individual until they grow to middle age before the features becomes significant.
Therefore, This is a human hereditary disease that is caused by a dominant allele but does not show up in affected individuals until they are in middle age is huntington's disease
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