The individual marked by the arrow died of Huntington's disease at the age of 45.Which of the following statements could be true about this individual?
a. If the individual has more than 37 repeats in the HTT gene it is because during gamete formation in his parent the NEW STRAND slipped backward during DNA replication.
b. If the individual has more than 37 repeats in the HTT gene it is because during gamete formation in his parent the TEMPLATE strand slipped backward during DNA replication.
c. The individual has two disease alleles for the HTT gene.
d. The individual has at least 37 repeats in the HTT gene and the disease is penetrant.