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 b globin chain synthesis.
C) variable but decreased $\gamma$ chain synthesis.
D) no gamma chain synthesis.