Which one of the following character in man is controlled by a recessive gene?

Options

A. colour blindness
B. Woolly hair
C. Brachydactyly
D. Curly hairs

Answer

To determine which character in man is controlled by a recessive gene, we need to analyze the provided options one by one:

1. **Color Blindness**:
- Color blindness is known to be an X-linked recessive disorder. This means that the gene responsible for color blindness is located on the X chromosome and is recessive. Therefore, for a male (who has one X and one Y chromosome) to be color blind, he must inherit the recessive allele from his mother.
- Conclusion: Color blindness is controlled by a recessive gene.

2. **Wooly Hair**:
- Wooly hair is characterized by incomplete dominance. This means that the trait is not purely recessive or dominant but rather shows a blending of traits when both alleles are present. Thus, this trait is controlled by dominant genes.
- Conclusion: Wooly hair is not controlled by a recessive gene.

3. **Brachydactyly**:
- Brachydactyly is an autosomal dominant trait. This means that only one copy of the dominant allele is needed for the trait to be expressed. Therefore, it is not controlled by a recessive gene.
- Conclusion: Brachydactyly is not controlled by a recessive gene.

4. **Curved Ears**:
- Curved ears are also typically considered to be a trait that can be influenced by dominant genes. Therefore, this trait is not controlled by a recessive gene.
- Conclusion: Curved ears are not controlled by a recessive gene.

After analyzing all the options, we can conclude that the character in man that is controlled by a recessive gene is:

**Answer: Color Blindness**

---