1) What does the notation TT mean to geneticists? A)two dominant alleles

B) two recessive alleles

C) at least one dominant allele

D) one dominant and one recessive allele

2) Scientists call an organism that has two different alleles for a trait a

A) hybrid

B) trait

C) purebred

D) factor

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.