Tongue rolling is a genetic trait. The ability to roll the tongue is a dominant trait. Suppose you have a friend whose parents are heterozygous for rolling their tongues. Answer the following questions about the parents and possible offspring.

what are the options

explanation:

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.