Cause of the xeroderma pigmentosum is?
Ans. is 'b' i.e. DNA repair defect * Xeroderma pigmentosum is an autosomal recessive disease with defect in DNA repair. It is characterized by extreme sensitivity to sunlight. The enzymes affected in this condition are:1. UV specific endonuclease (most common)2. DNA polymerase I3. DNA ligase
Missense mutation
DNA rapair defect
Trisomy
Production of guanine guanine dimmers in DNA