Huntington diseases tend to strike earlier and lead to the more rapid progression of the symptoms as it moves from generation to generation. As well, it tends to hit earlier and progress more speedily when it is passed from father to his children rather than from the mother. Which generic phenomenon (or phenomena) is (are) likely operating here?
A) Incomplete penetrance
B) Sex-limited inheritance
C) Genetic anticipation
D) Parental imprinting
E) More than one of the above.