What is used to make a linkage map for a group of organisms? the number of traits one gene set can control in the group
the number of phenotypes a gene set can produce in the group
the number of times linked genes are separated in the group
the number of different genes found in the group

the best answer is, earth strong )

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.