Catalyzes the attachment of tyrosine to tRNA (Tyr) in a two-step reaction: tyrosine is first activated by ATP to form Tyr-AMP and then transferred to the acceptor end of tRNA (Tyr). Defects in YARS2 are the cause of myopathy with lactic acidosis and sideroblastic anemia type 2 (MLASA2) [MIM:613561]. MLASA2 is a rare oxidative phosphorylation disorder specific to skeletal muscle and bone marrow. Affected individuals manifest sideroblastic anemia, progressive lethargy, muscle weakness, and exercise intolerance associated with persistent lactic acidemia.