Assertion :- Incomplete dominance made it possible to distiguish heterogyzous from homozygous.
Reason :- In incomplete dominance `F_(1)` had a phenotype that did not resemble either of the two parents and was in between the two.

Options

A. If both Assertion & Reason are True & the Reason is a correct explanation of the Assertion.
B. If both Assertion & Reason are trur but Reason is not a correct explanation of the Assertion.
C. If Assertion is True but the Reason is Flase.
D. If both Assertion & Reason are false.

Answer

To solve the question regarding the assertion and reason related to incomplete dominance, we can follow these steps:

### Step 1: Understand the Assertion
The assertion states that "incomplete dominance made it possible to distinguish heterozygous from homozygous." In incomplete dominance, the phenotype of the heterozygous individual is intermediate between the phenotypes of the two homozygous parents.

### Step 2: Analyze the Reason
The reason provided is that "in incomplete dominance, F1 had a phenotype that did not resemble either of the two parents and was in between the two." This means that in a cross between two different homozygous parents, the F1 generation exhibits a phenotype that is a blend of the two parental traits.

### Step 3: Example of Incomplete Dominance
Consider a classic example of flower color in snapdragons:
- Parent 1 (homozygous red): RR
- Parent 2 (homozygous white): rr
- F1 generation (heterozygous): Rr will exhibit a pink phenotype (intermediate).

This pink phenotype does not resemble either the red or the white parent, thus allowing us to distinguish the heterozygous Rr from the homozygous RR or rr.

### Step 4: Conclusion on Assertion and Reason
Both the assertion and the reason are true. The reason correctly explains why the assertion holds true in the context of incomplete dominance.

### Step 5: Determine the Correct Option
Based on the analysis:
- Both the assertion and reason are true.
- The reason is the correct explanation of the assertion.

Thus, the correct answer is option A: both assertion and reason are true, and the reason is the correct explanation of the assertion.

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