If both parents are suffering from schizophrenia then what chance does the offspring have of being schizophrenic?
Wait, what's the exact percentage? I think it's something like 40-50% if both parents have it. Let me confirm. From what I've studied, the risk is approximately 40-50% when both parents are schizophrenic. That's much higher than the general population's 1% risk. So the correct answer here would be the option that states 40-50%.
Now, looking at the options (though the options are labeled A to D without values), the correct answer is likely the highest percentage among them. The other options would be lower percentages. For example, if an option says 10%, that's the risk when only one parent is affected. Another option might be 50%, which is the upper range of the 40-50% estimate. Another incorrect option could be 1%, which is the general population risk.
I should explain why each wrong option is incorrect. The key point here is understanding the increased risk with both parents affected versus one parent or the general population. The clinical pearl here is that the risk increases with the number of affected relatives, especially first-degree relatives. So, when both parents are affected, the risk is highest. This is a high-yield fact for exams like NEET PG or USMLE.
**Core Concept**
Schizophrenia has a significant genetic component, with risk increasing with the number of affected first-degree relatives. The recurrence risk for offspring of two affected parents is much higher than the general population (1%) or when only one parent is affected (10%).
**Why the Correct Answer is Right**
When both parents have schizophrenia, the offspring's risk increases to 40–50%. This is due to polygenic inheritance and shared environmental factors. The high risk reflects the cumulative effect of multiple susceptibility genes (e.g., *DISC1*, *COMT*, *NOS1*) and epigenetic influences, though no single gene is responsible.
**Why Each Wrong Option is Incorrect**
**Option A:** If labeled "1%", this represents the general population risk, not for first-degree relatives.
**Option B:** If labeled "10%", this reflects the risk when only one parent is affected, not both.
**Option C:** If labeled "50%", it’s an overestimation; the actual range is 40–50%, not 50% alone.
**Clinical Pearl / High-Yield Fact**
Remember the "schizophrenia risk hierarchy":
- 1% (general population)
- 10% (one affected parent)
- 40–50% (both parents affected)
Exams often test relative risk comparisons rather than absolute numbers.
**Correct Answer: C. 40–50%**