Apoptosis is the process of .
a) presenting epitope in an MHC
b) protein differentiating into a regulatory T
c) cell multiplying into a clone repertoire
d) programmed cell death

Programmed cell death

Explanation:

Apoptosis also known as programmed cell death occurs in multicellular organisms. The cells here are regulated by cell division and cell death.

Cell death occurs when the intra cellular death program occurs when the cells are no more needed.

you know they are heterozygous for a trait because they have it as jj or jj.