In a Chi-Square Test to Determine If Two Genes Are

In a chi-square test to determine if two genes are linked or assorting independently, what is the default (null) hypothesis that is tested?

A) The genes are linked to one another.
B) The genes are assorting independently.
C) The genes are located on the sex chromosomes.
D) No crossing over occurs.
E) The distance between the genes is very small.