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Which mendelian principle will not opera...

Which mendelian principle will not operate if two genes under study are close together

A

Paired unit factor

B

Dominance

C

Segeration

D

Independent assortment.

Text Solution

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The correct Answer is:
### Step-by-Step Solution: 1. **Understanding Mendelian Principles**: Mendelian genetics is based on several principles, including the Law of Segregation, Law of Independent Assortment, and the concept of dominance. 2. **Identifying the Relevant Principle**: The question specifically asks about the principle that will not operate when two genes are close together. The principle that relates to the behavior of two genes is the Law of Independent Assortment. 3. **Law of Independent Assortment**: This law states that alleles of different genes assort independently of one another during gamete formation. This means that the inheritance of one trait will not affect the inheritance of another trait if the genes are located on different chromosomes or are far apart on the same chromosome. 4. **Effect of Gene Proximity**: When two genes are located close together on the same chromosome, they tend to be inherited together due to a phenomenon known as linkage. This means that they do not assort independently, which disrupts the expected 9:3:3:1 phenotypic ratio seen in dihybrid crosses. 5. **Conclusion**: Therefore, the Mendelian principle that will not operate when two genes are close together is the **Law of Independent Assortment**. ### Final Answer: The Mendelian principle that will not operate if two genes under study are close together is the **Law of Independent Assortment**. ---
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