Which of the following principles cannot be depicted by a monohybrid cross?

Law of independent assortment states that when two pairs of independent alleles enter into combination in the F2 generation, they exhibit independent dominant effects. It means that during the formation of gametes, the law of segregation operates but the factors assort themselves independently at random and freely. So, for explaining this principle a monohybrid cross will be insufficient. We will need a dihybrid cross to depict this. Thus, this is the correct answer.