Percentage of colur blindness in white female polulation is

Options

A. `4.5%`
B. `2.3%`
C. `0.5%`
D. Zero %

Answer

To solve the question regarding the percentage of color blindness in the white female population, we can follow these steps:

### Step-by-Step Solution:

1. **Understand Color Blindness**:
- Color blindness is a genetic disorder characterized by impaired color vision. It is primarily an X-linked inherited disorder.

2. **Genetic Basis**:
- The gene responsible for color blindness is located on the X chromosome.
- Males have one X and one Y chromosome (XY), while females have two X chromosomes (XX).

3. **Prevalence in Males vs. Females**:
- Since males have only one X chromosome, if that chromosome carries the gene for color blindness, they will express the trait. This leads to a higher prevalence of color blindness in males, approximately 8% in the white male population.
- In females, to express color blindness, both X chromosomes must carry the defective gene. If only one X chromosome is affected, the female will be a carrier but not express color blindness.

4. **Calculating Female Prevalence**:
- Due to the requirement for both X chromosomes to be affected for a female to express color blindness, the prevalence is significantly lower in females.
- The estimated prevalence of color blindness in the white female population is around 0.5%.

5. **Conclusion**:
- Therefore, the percentage of color blindness in the white female population is 0.5%.

### Final Answer:
The percentage of color blindness in the white female population is **0.5%**.

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