Select the odd one out w.r.t chromosomal theory of inheritance

Options

A. It was proposed by Sutton and Boveri
B. Behaviour of chromosomes is parallel to behaviour of genes
C. Chromosomes and genes occur in pairs in diploid cells respectively
D. The paired condition of both chromosomes as well as Mendellan factors is restored during fertilization

Answer

To solve the question of selecting the odd one out with respect to the chromosomal theory of inheritance, we will analyze each option provided in the context of the theory.

### Step-by-Step Solution:

1. **Understanding the Chromosomal Theory of Inheritance**:
- The chromosomal theory of inheritance states that genes are located on chromosomes, and the behavior of chromosomes during meiosis and fertilization explains the inheritance of traits.

2. **Evaluating Option 1**:
- **Statement**: "It was proposed by Sutton and Boveri."
- **Analysis**: This statement is correct. The chromosomal theory of inheritance was indeed proposed by Theodor Boveri and Walter Sutton in the early 1900s.

3. **Evaluating Option 2**:
- **Statement**: "Behavior of the chromosome is parallel to the behavior of the genes."
- **Analysis**: This statement is also correct. The behavior of chromosomes during cell division reflects the segregation and independent assortment of genes.

4. **Evaluating Option 3**:
- **Statement**: "Chromosome and genes occur in pairs in diploid cells respectively."
- **Analysis**: This statement is misleading. While chromosomes do occur in pairs in diploid cells, genes do not necessarily occur in pairs. Genes can be present in multiple forms (alleles), and during gamete formation, they segregate independently.

5. **Evaluating Option 4**:
- **Statement**: "The paired condition of both chromosomes as well as Mendelian characters is restored during fertilization."
- **Analysis**: This statement is correct. During fertilization, two haploid gametes combine to restore the diploid condition, which includes the pairing of chromosomes.

6. **Conclusion**:
- Based on the evaluations, the odd one out is **Option 3**: "Chromosome and genes occur in pairs in diploid cells respectively," as it inaccurately describes the relationship between chromosomes and genes.

### Final Answer:
The odd one out with respect to the chromosomal theory of inheritance is **Option 3**.

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