Which of the following statements is correct for colourblindness ?

Options

A. It is due to mutation in certain genes present on y chromosome.
B. It occurs more in females as compared to male.
C. The son of the carrier woman has 50 % chances be being colour blind.
D. It is autosomal linked genetic disorder.

Answer

To solve the question regarding colorblindness and determine which statement is correct, we will analyze each option step by step.

### Step 1: Understand Colorblindness
Colorblindness is primarily an X-linked recessive disorder. This means that the genes responsible for colorblindness are located on the X chromosome, and the disorder manifests in individuals who have a specific genetic makeup.

### Step 2: Analyze Each Statement

**Statement A:** "It is due to mutation in certain genes present on Y-chromosome."
- **Analysis:** This statement is incorrect. Colorblindness is linked to mutations on the X chromosome, not the Y chromosome. Therefore, this statement is false.

**Statement B:** "It occurs more in females as compared to males."
- **Analysis:** This statement is also incorrect. Since colorblindness is X-linked recessive, males (who have only one X chromosome) are more likely to express the trait if they inherit the affected X chromosome. Females have two X chromosomes, so they would need to inherit the affected gene on both X chromosomes to express colorblindness. Thus, this statement is false.

**Statement C:** "The son of a carrier woman has 50% chances of being colorblind."
- **Analysis:** This statement is correct. If a woman is a carrier (one normal X chromosome and one affected X chromosome), there is a 50% chance that she will pass on the affected X chromosome to her son. Since males have only one X chromosome, if they inherit the affected X, they will be colorblind. Therefore, this statement is true.

**Statement D:** "It is an autosomal linked genetic disorder."
- **Analysis:** This statement is incorrect. Colorblindness is not autosomal; it is specifically linked to the X chromosome, making it a sex-linked disorder. Therefore, this statement is false.

### Conclusion
After analyzing all the statements, the only correct statement regarding colorblindness is:

**C. The son of a carrier woman has 50% chances of being colorblind.**