Which of the following shows the greatest promise as a cancer chemotherapy agent?

a) a drug that interferes with organismal cellular respiration

b) a drug that prevents tetrad formation

c) a drug that prevents crossing over

d) a drug that prevents mitotic spindle from forming

D) A drug that prevents mitotic spindle from forming.

Explanation:

Drugs that prevent mitotic spindle formation for example Taxol (Paclitaxel) have been used very effectively in chemotherapy because they poison microtubles and inhibit the mitotic spindle. This in turn stops cancer cells from dividing and causes them to die.