Which of the following are sex linked?

Correct option is C

Colour blindness is a sex-linked condition, primarily carried on the X chromosome. It is more common in males because they have only one X chromosome, so a defect in the X chromosome will result in the condition. Females, who have two X chromosomes, would need both to carry the defect for the condition to manifest. The gene responsible for colour blindness is located on the X chromosome, making it a sex-linked disorder.

Information Booster:

• Colour blindness is most often an inherited condition, passed from mother to son through the X chromosome.
• The condition makes it difficult for individuals to distinguish between certain colours, particularly red and green.
• Approximately 8% of men and 0.5% of women worldwide are affected by some form of colour blindness.
• The severity of the condition can vary from person to person, with some being unable to perceive certain colours at all, while others may have mild difficulty.
• Red-green colour blindness is the most common form, followed by blue-yellow colour blindness.
• The condition is diagnosed through colour vision tests, which assess a person's ability to identify colours or numbers in a set of coloured dots.

Additional Information:

• Myopia (a), or nearsightedness, is a refractive error of the eye that is not sex-linked. It can be inherited, but it is not tied to the sex chromosomes.
• Malaria (b) is caused by a parasite and is not a genetic condition, so it is not sex-linked. It is transmitted through the bite of an infected mosquito.
• Night blindness (d) is often caused by vitamin A deficiency or retinal disorders, but it is not typically sex-linked. It is associated with the body's inability to adjust to low-light conditions.