Select the odd one out with respected to the chromosomal theory of inheritance

Options

A. It was proposed by Sutton and Boveri
B. The behavior of chromosomes is parallel to the behaviour of genes
C. Chromosomes and genes occur in pairs diploid and haploid cells, respectvely
D. The paired condition of both , chromosomes as well as Mendelian factors, is restored during fertilization

Answer

**Step-by-Step Solution:**

1. **Understand the Chromosomal Theory of Inheritance**: The chromosomal theory of inheritance was proposed by scientists Sutton and Boveri. It states that genes are located on chromosomes and that the behavior of chromosomes during cell division is similar to the behavior of Mendel's factors (genes).

2. **Review Mendel's Laws**: Mendel's laws of inheritance include the Law of Segregation, which states that during gamete formation, the alleles (factors) for a trait segregate from each other so that each gamete carries only one allele for each gene.

3. **Analyze the Statements**: You are given several statements regarding the chromosomal theory of inheritance. You need to identify which statement is incorrect (the "odd one out").

4. **Evaluate Each Statement**:
- **Statement A**: "Sutton and Boveri proposed the chromosomal theory of inheritance." - This is correct.
- **Statement B**: "The behavior of chromosomes is parallel to the behavior of genes." - This is also correct.
- **Statement C**: "Chromosomes and genes are in pairs respectively in diploid and haploid cells." - This is incorrect. In diploid cells (2N), chromosomes are in pairs, but in haploid cells (N), there is only one set of chromosomes, and therefore, no pairs.
- **Statement D**: "Mendelian factors and chromosomes are restored during fertilization." - This statement is correct.

5. **Identify the Odd One Out**: Based on the evaluation, Statement C is the odd one out because it incorrectly states that chromosomes and genes are in pairs in haploid cells.

**Final Answer**: The odd one out is Statement C: "Chromosomes and genes are in pairs respectively in diploid and haploid cells."

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