In an Autosomal Recessive (AR) disorder,one parent is normal and the other is carrier and the child is also affected.What is the reason?

In an Autosomal Recessive (AR) disorder,one parent is normal and the o

1.	In an Autosomal Recessive (AR) disorder,one parent is normal and the other is carrier and the child is also affected.What is the reason?
A.	Germ line mosaicism
B.	Genomic imprinting
C.	Penetration
D.	Uniparental disomy
Answer» E.