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) Penetrattion, (D) Uniparental disomy
Answer is D. If one parent is normal for an autosomal recessive disorder and the other is carrier. No child should be affected.