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Mendel Second Genetic Law

Why the proportion 9:3:3:1 in Mendel's Law brakes or is not an absolute true?
I need to have a nice and easy example to present to class
Is epistasis one of the reasons why the law brakes can you explain to me in easier terms/example how can I present this?
Thank you

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Mendel's Second Law of independent assortment which states that "during gamete formation the segregation of the alleles of one allelic pair is independent of the segregation of the alleles of another allelic pair" does not hold true all the time. The proportion or phenotypic ratio of 9:3:3:1 is not universally true, due to the following reasons:

1. The law of independent assortment is accurate for genes that are on ...