The Different Members of The $\beta$ -Globin Gene Family
A) Are Expressed Differently in Different Tissues

The different members of the $\beta$ -globin gene family

A) are expressed differently in different tissues.
B) are expressed differently at different times of development.
C) are expressed in the same way in different tissues.
D) are expressed in the same way at different times of development.
E) have no known function.