1. Normal allele is copied. What is the error in this representation of the steps
involved in gene therapy?
2. Normal allele is removed from
a chromosome.
3. Normal allele is added to cell
of person with genetic disorder.

these muscles maintain the blood pressure in the vessels. the smooth muscles are innervated by nerves of the autonomic nervous system. when the muscles contract, they cause vasoconstriction of the vessels and increase blood pressure. when the muscles relax, they enable vasodilation of the   blood vessels hence reduce blood pressure.