Question

Given below are two statements:
Statement I: A single gene can affect multiple phenotypic expressions.
Statement II: In a polygenic trait, multiple genes contribute to a phenotypic expression.

• A. Both I and II are correct
• B. Both I and II are incorrect
• C. I is correct but II is incorrect
• D. I is incorrect but II is correct

Hint:

1 Gene $\rightarrow$ Many Traits = Pleiotropy. Many Genes $\rightarrow$ 1 Trait = Polygenic.

Answer 1

The Correct Option is A

Step 1: Concept
Genetic expression can involve pleiotropy or polygenic inheritance.

Step 2: Meaning
Pleiotropy is when one gene influences multiple, seemingly unrelated phenotypic traits.

Step 3: Analysis
Statement I describes pleiotropy (e.g., Sickle Cell Anemia). Statement II describes polygenic inheritance, where traits like skin color or height are determined by the additive effect of several different genes.

Step 4: Conclusion
Since both statements accurately define these fundamental genetic principles, both are correct. Final Answer: (A)