The following blanks can be filled only by numbers.
1. Gregor Mendel conducted hybridisation experiments on garden peas for (P) years .
2. Mendel selected (Q) true - breeding pea plant varieties.
3. In a human population , there are (R) alleles for ABO Blood group.
4. In Drosophila, genes for white eye and yellow body show (S) % recombination
The correct arrangement is

Options

A. `P lt Q lt R lt S`
B. `R lt P lt Q lt S`
C. `S lt R lt P lt Q`
D. `R lt S lt Q lt P`

Answer

To solve the question regarding the blanks that need to be filled with specific numbers, we will follow these steps:

### Step-by-Step Solution:

1. **Identify the number of years Mendel conducted his experiments (P)**:
- Gregor Mendel conducted hybridization experiments on garden peas for **7 years**.
- Thus, P = 7.

2. **Determine the number of true-breeding pea plant varieties selected by Mendel (Q)**:
- Mendel selected **14 true-breeding varieties** of pea plants for his experiments.
- Therefore, Q = 14.

3. **Find the number of alleles for the ABO blood group in humans (R)**:
- In a human population, there are **3 alleles** for the ABO blood group (A, B, and O).
- Hence, R = 3.

4. **Calculate the percentage of recombination in Drosophila for white eye and yellow body (S)**:
- In Drosophila, the genes for white eye and yellow body show **1.3% recombination**.
- Thus, S = 1.3.

5. **Arrange the values in increasing order**:
- The values we have are:
- S = 1.3
- R = 3
- P = 7
- Q = 14
- Arranging these in increasing order gives us: S < R < P < Q.

### Final Arrangement:
- The correct arrangement is: **S (1.3), R (3), P (7), Q (14)**.

### Answer:
The correct arrangement is **(S, R, P, Q)** which corresponds to **(1.3, 3, 7, 14)**.

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