A Dihybrid Test Cross Is Made Between Genes H and I.Four

Multiple Choice

A dihybrid test cross is made between genes H and I.Four categories of offspring are produced: HI, Hi, hI, and hi.You wish to use the $\chi$ ² test to test the hypothesis that the H and I genes are unlinked.How many degrees of freedom would there be in this test?

A) 1
B) 2
C) 3
D) 4
E) 0