All are effects of crossing over of homologous chromosomes during prophase i of meiosis
- increased genetic variety
- increased number of chromosomes in the offspring
- the appearance of new phenotypes in the offspring
- possible harmful mutations from cross-over errors

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.