Dihybrid Practice Problems s1
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DIHYBRID PRACTICE PROBLEMS
R = running mice B = Black mice r = waltzing mice (run in circles) b = brown mice
1. RrBb x RRbb What are the possible genotypes? What is the phenotypic ratio?
2. rrBb x Rrbb What are the possible genotypes? What is the phenotypic ratio?
3. Cross a heterozygous running, heterozygous black mouse with a waltzing brown mouse. What are the possible genotypes? What is the phenotypic ratio?
4. Cross a homozygous running, heterozygous black mouse with a homozygous running, brown mouse. What are the possible genotypes? What is the phenotypic ratio?
5. Cross a waltzing brown mouse with a waltzing brown mouse. What are the possible genotypes? What is the phenotypic ratio?
DIHYBRID PRACTICE PROBLEMS
R = running mice B = Black mice r = waltzing mice (run in circles) b = brown mice
1. RrBb x RRbb What are the possible genotypes? What is the phenotypic ratio?
2. rrBb x Rrbb What are the possible genotypes? What is the phenotypic ratio?
3. Cross a heterozygous running, heterozygous black mouse with a waltzing brown mouse. What are the possible genotypes? What is the phenotypic ratio?
4. Cross a homozygous running, heterozygous black mouse with a homozygous running, brown mouse. What are the possible genotypes? What is the phenotypic ratio?
5. Cross a waltzing brown mouse with a waltzing brown mouse. What are the possible genotypes? What is the phenotypic ratio?
DIHYBRID PRACTICE PROBLEMS
R = running mice B = Black mice r = waltzing mice (run in circles) b = brown mice
1. RrBb x RRbb What are the possible genotypes? What is the phenotypic ratio?
2. rrBb x Rrbb What are the possible genotypes? What is the phenotypic ratio?
3. Cross a heterozygous running, heterozygous black mouse with a waltzing brown mouse. What are the possible genotypes? What is the phenotypic ratio?
4. Cross a homozygous running, heterozygous black mouse with a homozygous running, brown mouse. What are the possible genotypes? What is the phenotypic ratio?
5. Cross a waltzing brown mouse with a waltzing brown mouse. What are the possible genotypes? What is the phenotypic ratio?