MN blood type is an example for

Options

A. Incomplete dominance
B. Codominance
C. Partial dominance
D. Complete dominance

Answer

To determine what the MN blood type is an example of, we will analyze the concepts of inheritance patterns, specifically focusing on the options provided: incomplete dominance, co-dominance, partial dominance, and complete dominance.

### Step-by-Step Solution:

1. **Understanding Blood Types**:
- The MN blood type refers to a specific blood group system where individuals can have one of three possible phenotypes: M, N, or MN. This is determined by the presence of two alleles, M and N.

2. **Reviewing the Options**:
- **Incomplete Dominance**: This occurs when the phenotype of the heterozygote is intermediate between the phenotypes of the two homozygotes. For example, if one allele is red and the other is white, the offspring may be pink.
- **Co-Dominance**: This occurs when both alleles in a heterozygote are fully expressed, resulting in a phenotype that shows both traits simultaneously. For example, in the case of MN blood type, both M and N antigens are expressed on the surface of red blood cells.
- **Partial Dominance**: This is another term for incomplete dominance, where one allele does not completely mask the other.
- **Complete Dominance**: This occurs when one allele completely masks the effect of another allele. For example, in pea plants, if one allele for purple flowers completely masks the allele for white flowers, the plant will only show purple flowers.

3. **Identifying the Correct Answer**:
- Since the MN blood type expresses both M and N antigens equally in individuals with the MN genotype, it is an example of co-dominance. In this case, both alleles contribute to the phenotype without one overshadowing the other.

4. **Conclusion**:
- Therefore, the MN blood type is an example of **co-dominance**.