Question

Assertion (A): A character showing continuous variation has an unbroken range of phenotypes in a population. Reason (R): Differences are caused by allelic variation in one or many genes, while in some cases, all variation is environmental and has no genetic basis.

• A. Both (A) and (R) are correct and (R) is the correct explanation of (A).
• B. Both (A) and (R) are correct but (R) is NOT the correct explanation of (A).
• C. (A) is correct but (R) is not correct.
• D. (A) is not correct but (R) is correct.

Hint:

Continuous = No gaps. Many genes + Environment = A smooth spectrum of traits.

Answer 1

The Correct Option is A

Step 1: Concept
Continuous variation refers to traits like height that show a spectrum rather than neat categories.

Step 2: Meaning
This spectrum results from multiple genes (polygenic) and environmental influences.

Step 3: Analysis
Assertion (A) defines the “unbroken range.” Reason (R) explains that small allelic differences across many genes and environmental factors blur the lines between categories, making the variation continuous.

Step 4: Conclusion
Both are correct, and (R) provides the underlying reason for (A).

Final Answer: (A)