Mendel's dihybrid crosses test the hypothesis that a. the heredity material for a single trait has 4 alleles.    From Wordnik.com.  [Yahoo! Answers: Latest Questions] Reference

Recall that unlinked mutations will segregate independently (your basic dihybrid inheritance as first observed by Gregor Mendel) whereas linked mutations will not.    From Wordnik.com.  [OpenWetWare - Recent changes [en]] Reference

Genetics Question: If the Phenotypic Ratio for the cross betweeen two dihybrid organisms for the F2 generation? is 9: 3: 3: 1, what are the genotypes of the parents?.    From Wordnik.com.  [Yahoo! Answers: Latest Questions] Reference

However, Chi square tests for linkage are performed from a test cross (1: 1: 1: 1) rather than ratios from the dihybrid cross (9: 3: 3: 1 ratio) we did, so we can't use that statistical tool this time.    From Wordnik.com.  [OpenWetWare - Recent changes [en]] Reference