In rumbunnies large ears (E) is dominant to small ears (e) and tufted ears (T) is dominant to shaven ears (t). Two heterozygous rumbunnies are...

In rumbunnies large ears (E) is dominant to small ears (e) and tufted ears (T) is dominant to shaven ears (t). Two heterozygous rumbunnies are crossed, with the following results: 420 large tufteds, 189 small shavens, and 141 large shavens. How well do these results correspond with expectation if large ears are epistatic over ear hair length? If small ears are epistatic over ear hair length? Use chi-square to prove your position.