Parallelism between factors and chromosome led to the formation of

Options

A. Cell theroy
B. Chromosonal theory of inheritance
C. Pangenesis theory
D. Pre formation theory

Answer

To answer the question regarding what the parallelism between factors and chromosomes leads to, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Parallelism**:
- The term "parallelism" in genetics refers to the relationship between genes (factors) and chromosomes. It suggests that both genes and chromosomes behave similarly during inheritance.

2. **Identifying Key Conditions**:
- There are several key conditions that illustrate this parallelism:
- **Occurrence in Pairs**: Both genes and chromosomes exist in pairs. For example, diploid organisms have two copies of each chromosome and thus two alleles for each gene.
- **Segregation During Gamete Formation**: During meiosis, the pairs of chromosomes segregate, leading to the formation of gametes that contain only one chromosome from each pair. This is also true for alleles, which segregate into different gametes.
- **Independent Segregation**: The pairs of chromosomes segregate independently of one another, which means the segregation of one pair does not affect the segregation of another pair. This is also true for genes located on different chromosomes.

3. **Connecting to Theories of Inheritance**:
- The parallelism between genes and chromosomes leads to the formulation of important genetic theories. The most relevant theory in this context is the **Chromosomal Theory of Inheritance**. This theory states that genes are located on chromosomes, and the behavior of chromosomes during meiosis explains the inheritance patterns observed in organisms.

4. **Conclusion**:
- Therefore, the parallelism between factors (genes) and chromosomes leads to the formation of the **Chromosomal Theory of Inheritance**.

### Final Answer:
The parallelism between factors and chromosomes leads to the formation of the **Chromosomal Theory of Inheritance**.