This picture shows normal blood cells, which are round, and sickle cells, which appear much longer. people with sickle cells suffer from sickle cell anemia, which is an inherited disease. it is caused by a change in a gene responsible for production of hemoglobin. this type of change is known as a(n) a) cancer. b) genotype. c) mutation. d) acquired characteristic.

Imagine a self-reactive t cell that has not undergone clonal deletion in the thymus (that is to say, it has escaped central tolerance). if it encounters self antigen in the absence of an infection or inflammation, what will happen to this self-reactive t cell? (select two answers) (a) the t cell undergoes clonal expansion. (b) the t cell gains effector functions. (c) the t cell undergoes apoptosis. (d) the t cell becomes activated. (e) the t cell becomes anergic.