Match the experimental approach with the corresponding experimental strategy.
Approach:
X = Biochemistry
Y = Genetics
Z = Cell biology
Strategy:
i = Watch the process in a microscope. Follow the dynamics of particular proteins in a living cell. Does inhibiting the function of a specific protein in a living cell block the process you are interested in?
ii = Purify the proteins involved and study their behavior in vitro. Recapitulate the process in a test tube.
iii = Isolate a mutant organism that is defective in the process.

Biochemistry is the study of all chemical process(metabolic process) occurs in living organisms. Proteins make enzymes that catalyze any chemical reaction so proteins are studied in detail in biochemistry by purifying protein. Then the interaction and behavior of these proteins are studied in-vitro.

Cell biology involves the study of the structure and function of whole-cell and processes involved in the functioning of the cell. So formation of particular protein or inhibition of any process can be studied in cell biology. Cell and its process can be seen under a specific microscope.

Genetics is related to genes present in organisms so the study of mutant organisms comes under genetics because mutation occurs in a gene. Therefore the right answer is X=ii, Y=iii, and Z=i.