Question

Write notes on the following: ( Colourblindness.

Hint:

Colourblindness is often inherited as an X-linked recessive trait and affects primarily males.

Answer 1

Step 1: What is Colourblindness?
Colourblindness is a visual impairment where an individual is unable to perceive certain colors or differentiate between them. This condition is often inherited and affects a significant portion of the population.
Step 2: Types of Colourblindness.
1. Red-Green Colourblindness: The most common form, where individuals cannot distinguish between red and green hues. 2. Blue-Yellow Colourblindness: A less common form where individuals have difficulty distinguishing between blue and yellow hues. 3. Complete Colourblindness: A rare condition where individuals cannot perceive any colors and see the world in shades of gray.
Step 3: Genetic Cause.
Colourblindness is often caused by a mutation in the X chromosome, making it more common in males. It is a recessive genetic trait, meaning males with one mutated gene on the X chromosome will express the condition.
Step 4: Conclusion.
Colourblindness is a genetic condition that primarily affects males and can be diagnosed through various color vision tests.
Final Answer: \[ \boxed{\text{Colourblindness is a genetic condition where individuals have difficulty perceiving certain colors.}} \]