Understanding Codominance: A Blood Type Worksheet
Blood types are a fascinating example of codominance in genetics. In this worksheet, we will explore how codominance affects the inheritance of blood types.
What is Codominance?
Codominance is a phenomenon in genetics where two different alleles (forms) of a gene have an equal effect on the expression of a trait. In the case of blood types, the ABO gene has three alleles: A, B, and O. The A and B alleles are codominant, while the O allele is recessive.
Blood Type Genotypes and Phenotypes
Here are the possible genotypes and phenotypes for blood types:
| Genotype | Phenotype (Blood Type) |
|---|---|
| AA or AO | A |
| BB or BO | B |
| AB | AB |
| OO | O |
Understanding Codominance in Blood Types
Now, let's examine how codominance affects the inheritance of blood types. When an individual has two different alleles, such as A and B, the resulting phenotype is AB. This is because the A and B alleles are codominant, and neither one is recessive.
Worksheet Questions
Complete the following questions to test your understanding of codominance in blood types:
- What is the genotype of an individual with blood type A?
- What is the phenotype of an individual with genotype AB?
- Can an individual with blood type O have the genotype AO?
- What is the genotype of an individual with blood type B?
- Can an individual with genotype BB have the phenotype AB?
Answers Key
Here are the answers to the worksheet questions:
- The genotype of an individual with blood type A can be AA or AO.
- The phenotype of an individual with genotype AB is AB.
- No, an individual with blood type O can only have the genotype OO.
- The genotype of an individual with blood type B can be BB or BO.
- No, an individual with genotype BB can only have the phenotype B.
📝 Note: Remember that the A and B alleles are codominant, while the O allele is recessive. This affects how the genotypes and phenotypes are expressed.
📝 Note: Make sure to review the genotype and phenotype combinations in the table above to help you answer the worksheet questions.
Conclusion
In conclusion, understanding codominance is crucial in determining the inheritance of blood types. By recognizing how the A and B alleles are codominant, we can predict the phenotypes of individuals based on their genotypes. This knowledge is essential in medical fields, such as transfusion medicine, where blood type compatibility is critical.
What is codominance in genetics?
+Codominance is a phenomenon in genetics where two different alleles have an equal effect on the expression of a trait.
What are the three alleles of the ABO gene?
+The three alleles of the ABO gene are A, B, and O.
What is the phenotype of an individual with genotype AB?
+The phenotype of an individual with genotype AB is AB.
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