Which of the following disorder is not hereditary?

Options

A. Haemophilia
B. Cataract
C. Sickle cell anaemia
D. Colour blindness.

Answer

To determine which disorder is not hereditary, we need to analyze each option provided in the question. Here’s a step-by-step solution:

### Step 1: Understand the term "hereditary"
Hereditary refers to traits or disorders that can be passed from parents to their offspring. If a disorder is hereditary, it means that there is a significant chance that the children of affected parents will also inherit the disorder.

**Hint:** Remember that hereditary disorders are often linked to genes passed down from parents.

### Step 2: Analyze the first option - Hemophilia
Hemophilia is an X-linked recessive disorder. This means that the gene responsible for hemophilia is located on the X chromosome and can be passed from parents to their children. Therefore, hemophilia is hereditary.

**Hint:** X-linked disorders often affect males more than females due to the presence of one X chromosome in males.

### Step 3: Analyze the second option - Cataract
Cataracts are primarily associated with aging and are characterized by the opaqueness of the lens in the eye. They are not caused by genetic factors that can be inherited from parents. Hence, cataracts are not considered a hereditary disorder.

**Hint:** Think about whether the condition is linked to age or environment rather than genetics.

### Step 4: Analyze the third option - Sickle Cell Anemia
Sickle cell anemia is an autosomal recessive disorder, meaning that it can be passed from parents to offspring if both parents carry the gene. Therefore, sickle cell anemia is hereditary.

**Hint:** Autosomal disorders can be inherited regardless of the sex of the offspring.

### Step 5: Analyze the fourth option - Color Blindness
Color blindness is also an X-linked recessive disorder, similar to hemophilia. It can be passed from parents to children, making it hereditary.

**Hint:** Consider how traits linked to the X chromosome are inherited differently in males and females.

### Conclusion
After analyzing all the options, the disorder that is not hereditary is **cataract**.

**Final Answer:** Cataract is the disorder that is not hereditary.