If in a population, frequency of organisms of recessive trait is 25% then calculate the frequency of recessive allele :

Options

A. 0.25
B. 0.5
C. 0.75
D. 0.05

Answer

To solve the problem of calculating the frequency of the recessive allele given that the frequency of organisms with the recessive trait is 25%, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Given Information**:
- The frequency of the recessive trait (homozygous recessive individuals) is given as 25%. This can be represented as \( q^2 = 0.25 \).

2. **Calculate the Frequency of the Recessive Allele**:
- To find the frequency of the recessive allele \( q \), we take the square root of the frequency of the recessive trait:
\[ q = \sqrt{q^2} = \sqrt{0.25} = 0.5 \]

3. **Convert to Percentage**:
- To express the frequency of the recessive allele as a percentage, we multiply by 100:
\[ q = 0.5 \times 100\% = 50\% \]

4. **Conclusion**:
- Therefore, the frequency of the recessive allele is 0.5 (or 50%).

### Final Answer:
The frequency of the recessive allele is 0.5 (or 50%).

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