A Patient With $\beta$ ⁺-Thalassemia Has, from That Gene Locus:
A) Variable but Decreased

A patient with $\beta$ ⁺-thalassemia has, from that gene locus:

A) Variable but decreased $\beta$ globin chain synthesis
B) No $\beta$ globin chain synthesis
C) Variable but decreased $\gamma$ chain synthesis
D) No gamma chain synthesis