In Morgan 's experiments on linkage , the percentage of white eyed miniature winged recompbinants in `F_(2)` generation is

Options

A. 1.3
B. 62.8
C. 37.2
D. 73.2

Answer

To solve the question regarding the percentage of white-eyed miniature winged recombinants in Morgan's F2 generation, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Context**:
- Morgan's experiments focused on the linkage of genes in Drosophila (fruit flies). He studied traits such as eye color and wing size, which are determined by specific genes.

2. **Identify the Traits**:
- The traits in question are:
- Eye color: White-eyed (recessive trait)
- Wing size: Miniature wings (also a recessive trait)

3. **Linkage and Recombination**:
- In linked genes, parental combinations are more common than recombinant combinations due to the close proximity of the genes on the chromosome.

4. **Expected Ratios**:
- In a typical dihybrid cross without linkage, the expected phenotypic ratio in the F2 generation would be 9:3:3:1. However, due to linkage, this ratio is altered.

5. **Morgan's Observations**:
- Morgan observed that in the F2 generation, 98.7% of the offspring were parental types, while only 1.3% were recombinant types in the first cross.
- In the second cross, he noted that the percentage of white-eyed miniature winged recombinants was 37.2%.

6. **Conclusion**:
- Therefore, the percentage of white-eyed miniature winged recombinants in the F2 generation is 37.2%.

### Final Answer:
The percentage of white-eyed miniature winged recombinants in the F2 generation is **37.2%**.

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