In garden pea plant , S. Blixt led to locate Mendel's seven characters on chromosomes numbers .

Options

A. 1,4,5,7
B. 1,4,5,6
C. 4,5,6,7
D. 2,3,4,7

Answer

### Step-by-Step Solution:

1. **Understanding Mendel's Experiments**:
- Gregor Mendel conducted experiments on the garden pea plant (Pisum sativum) to study inheritance patterns.
- He identified seven contrasting traits that he observed in the pea plants.

2. **Identifying the Seven Contrasting Traits**:
- The seven traits Mendel studied are:
1. Stem height (Tall vs. Dwarf)
2. Seed color (Yellow vs. Green)
3. Seed shape (Round vs. Wrinkled)
4. Pod color (Green vs. Yellow)
5. Pod shape (Inflated vs. Constricted)
6. Flower color (Purple vs. White)
7. Flower position (Axial vs. Terminal)

3. **Chromosomal Theory of Inheritance**:
- Mendel's work laid the foundation for the Chromosomal Theory of Inheritance, which states that genes are located on chromosomes.
- Each trait is controlled by a gene, and these genes are arranged linearly on chromosomes.

4. **S. Blixt's Contribution**:
- Scientist S. Blixt later mapped Mendel's seven characters to specific chromosomes in the garden pea plant.
- He determined that these traits are located on a total of 4 chromosomes, not 7 as initially thought.

5. **Mapping the Traits to Chromosomes**:
- According to S. Blixt:
- **Chromosome 1**: Seed color and flower color.
- **Chromosome 4**: Stem height, pod shape, and flower position.
- **Chromosome 5**: Pod color.
- **Chromosome 7**: Seed shape.

6. **Conclusion**:
- The seven contrasting characters identified by Mendel are located on four chromosomes in the garden pea plant.
- The correct answer, based on S. Blixt's findings, is that these traits are distributed across chromosomes 1, 4, 5, and 7.