Eyeless is a recessive gene on chromosome 4 of drosophila melanogaster. flies homozygous for ey have tiny eyes or no eyes at all. a male fly trisomic for chromosome 4 with genotype +/+/ey is crossed with a normal, diploid eyeless female.

what proportion of their progeny will be eyeless?

a. 1/6

b. 1/3

c. 1/2

d. 2/3

e. 1/8

f. 1/4

g. 3/8

h. 5/8

i. 3/4

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.