A disease of nervous system caused by a dominant allele that has no obvious phenotype till 40 years of age is called

A disease of nervous system caused by a dominant allele that has no ob

1.	A disease of nervous system caused by a dominant allele that has no obvious phenotype till 40 years of age is called
A.	alzheimer's disease
B.	parkinson's disease
C.	Huntington's disease
D.	Tay Sach's
Answer» D. Tay Sach's