Name ___________________________ Inheritance Worksheet
Instructions: Complete the Punnett Square questions below by completing the Punnett Square and filling in the genotype and phenotype ratios for the given traits that demonstrate complete dominance.
Single-Factor Cross (Monohybrid Cross)
RR x RR (where R is the dominant allele and r is the recessive allele; phenotype-round seeds are the dominant phenotype and wrinkled seeds are the recessive phenotype)
Genotype Ratios: Phenotype Ratios:
RR _____ Round seeds _____
Rr _____
rr _____ Wrinkled seeds _____
Yy x Yy (where Y is the dominant allele and y is the recessive allele; phenotype-yellow seeds are the dominant phenotype and green seeds are the recessive phenotype)
Genotype Ratios: Phenotype Ratios:
YY _____ Yellow seeds _____
Yy _____
yy _____ Green seeds _____
Two-Factor Cross (Dihybrid Cross)
R and Y are dominant alleles; r and y are recessive alleles. R gene encodes for plant seed shape and the Y gene for seed color. (Seed shape; round = dominant, wrinkled = recessive; Seed color: yellow = dominant; green = recessive.)
In the questions below, what will be the genotype and phenotype ratios of plants in these two-factor (“dihybrid”) crosses.
YyRr x YYRr
Genotype Ratios: Phenotype Ratios:
YY _____ Yellow seeds _____
Yy _____
yy _____ Green seeds _____
Genotype Ratios: Phenotype Ratios:
RR _____ Round seeds _____
Rr _____
rr _____ Wrinkled seeds _____
Now determine the combined ratios of phenotype by multiplying the ratios of each individual phenotype and add your answer below.
Yellow/Round ___________
Yellow/Wrinkled ___________
Green/Round ___________
Green/Wrinkled ___________
yyRr x YYrr
Genotype Ratios: Phenotype Ratios:
YY _____ Yellow seeds _____
Yy _____
yy _____ Green seeds _____
Genotype Ratios: Phenotype Ratios:
RR _____ Round seeds _____
Rr _____
rr _____ Wrinkled seeds _____
Now determine the combined ratios of phenotype by multiplying the ratios of each individual phenotype and add your answer below.
Yellow/Round ___________
Yellow/Wrinkled ___________
Green/Round ___________
Green/Wrinkled ___________
Instructions: Complete the Punnett Square questions below by completing the Punnett Square and filling in the genotype and phenotype ratios for the given traits that demonstrate codominance.
If one parent has type O blood and the other parent has type AB blood, what will be the possibility of having a child with type A blood?
Genotype Ratios: Phenotype Ratios:
O/O _____ Blood type O _____
A/O _____ Blood type A _____
B/O _____ Blood type B _____
A/B _____ Blood type AB _____
If one parent has type AB blood and the other parent has type AB blood, what will be the possibility of having a child with type B blood?
Genotype Ratios: Phenotype Ratios:
O/O _____ Blood type O _____
A/O _____ Blood type A _____
B/O _____ Blood type B _____
A/B _____ Blood type AB _____
If one parent has the alleles A/O and the other parent has the alleles B/O, what will be the possibility of having a child with type O blood?
Genotype Ratios: Phenotype Ratios:
O/O _____ Blood type O _____
A/O _____ Blood type A _____
B/O _____ Blood type B _____
A/B _____ Blood type AB _____
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