<p> DIHYBRID PRACTICE PROBLEMS</p><p>R = running mice B = Black mice r = waltzing mice (run in circles) b = brown mice</p><p>1. RrBb x RRbb What are the possible genotypes? What is the phenotypic ratio?</p><p>2. rrBb x Rrbb What are the possible genotypes? What is the phenotypic ratio?</p><p>3. Cross a heterozygous running, heterozygous black mouse with a waltzing brown mouse. What are the possible genotypes? What is the phenotypic ratio?</p><p>4. Cross a homozygous running, heterozygous black mouse with a homozygous running, brown mouse. What are the possible genotypes? What is the phenotypic ratio?</p><p>5. Cross a waltzing brown mouse with a waltzing brown mouse. What are the possible genotypes? What is the phenotypic ratio?</p><p>DIHYBRID PRACTICE PROBLEMS</p><p>R = running mice B = Black mice r = waltzing mice (run in circles) b = brown mice</p><p>1. RrBb x RRbb What are the possible genotypes? What is the phenotypic ratio?</p><p>2. rrBb x Rrbb What are the possible genotypes? What is the phenotypic ratio?</p><p>3. Cross a heterozygous running, heterozygous black mouse with a waltzing brown mouse. What are the possible genotypes? What is the phenotypic ratio?</p><p>4. Cross a homozygous running, heterozygous black mouse with a homozygous running, brown mouse. What are the possible genotypes? What is the phenotypic ratio?</p><p>5. Cross a waltzing brown mouse with a waltzing brown mouse. What are the possible genotypes? What is the phenotypic ratio?</p><p>DIHYBRID PRACTICE PROBLEMS</p><p>R = running mice B = Black mice r = waltzing mice (run in circles) b = brown mice</p><p>1. RrBb x RRbb What are the possible genotypes? What is the phenotypic ratio?</p><p>2. rrBb x Rrbb What are the possible genotypes? What is the phenotypic ratio?</p><p>3. Cross a heterozygous running, heterozygous black mouse with a waltzing brown mouse. What are the possible genotypes? What is the phenotypic ratio?</p><p>4. Cross a homozygous running, heterozygous black mouse with a homozygous running, brown mouse. What are the possible genotypes? What is the phenotypic ratio?</p><p>5. Cross a waltzing brown mouse with a waltzing brown mouse. What are the possible genotypes? What is the phenotypic ratio?</p>