A patient in his forties is diagnosed with Huntington disease. The patient's mother is healthy and a genetic evaluation shows 25 and 26 CAG repeats within her HTT alleles
The patient's father died at age 24 when the patient was 2 and no genetic evaluation can be done. It is most likely that:
A. the father was heterozygous for the defective HTT allele.
B. the father was homozygous for the defective HTT allele.
C. the mother is a carrier for the defective HTT allele.
D. the HTT gene acquired additional CAG repeats during the 40 years of the patient's life.
A
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