Cross a homozygous running, heterozygous black mouse with a waltzing brown mouse. What is the probable phenotype ratio? Show punnet square and all work. Solution Dihybrid cross Homozygous running & heterozygous black -mouse x heterozygous black & waltzing mouse Parental gametes --> RRBb x rrbb RB Rb RB Rb rb RrBb Rrbb RrBb Rabb rb RrBb Rrbb RrBb Rrbb rb RrBb Rrbb RrBb Rrbb rb RrBb Rrbb RrBb Rrbb F1-phenotypes Running black mouse Running brown mouse.