Law of Mendel which is not completely applicable

Options

A. Law of dominance
B. Law of segregation
C. Law of Independent Assortment
D. Co-dominance

Answer

### Step-by-Step Solution:

1. **Understanding Mendel's Laws**: Gregor Mendel proposed three fundamental laws of inheritance: the Law of Dominance, the Law of Segregation, and the Law of Independent Assortment. Each of these laws describes different aspects of how traits are inherited.

2. **Identifying the Laws**:
- **Law of Dominance**: States that in a heterozygote, one trait will conceal the presence of another trait for the same characteristic.
- **Law of Segregation**: States that during the formation of gametes, the two alleles responsible for a trait separate from each other.
- **Law of Independent Assortment**: States that alleles for different traits are distributed to gametes independently of one another.

3. **Analyzing the Options**: The question asks which law is not completely applicable. The options provided are:
- Law of Dominance
- Law of Segregation
- Law of Independent Assortment
- Co-dominance (not a Mendelian law)

4. **Examining the Law of Independent Assortment**: This law holds true when genes are located on different chromosomes. However, if genes are located on the same chromosome, they may not assort independently due to genetic linkage. This means that the inheritance of one gene can influence the inheritance of another gene located nearby on the same chromosome.

5. **Conclusion**: Since the Law of Independent Assortment does not always apply (especially when genes are linked on the same chromosome), it is the law that is not completely applicable.

6. **Final Answer**: The law of Mendel which is not completely applicable is the **Law of Independent Assortment**.