Morgan found that genes white eye and yellow body in Drosophila were very tightly linked and showed ________ percent recombination

Options

A. `1.3`
B. `16.2`
C. `37 .2`
D. `5.4`

Answer

To solve the question regarding the percentage of recombination between the white eye and yellow body genes in Drosophila, we can follow these steps:

### Step-by-Step Solution:

1. **Understand Linkage and Recombination**:
- Linkage refers to the tendency of genes located close to each other on a chromosome to be inherited together. Recombination occurs when genes are separated during meiosis, leading to new combinations of traits.

2. **Identify the Genes**:
- In this case, we are looking at two genes: one for eye color (white eye) and one for body color (yellow body) in Drosophila.

3. **Recall Morgan's Findings**:
- Thomas Hunt Morgan conducted experiments with Drosophila and found that these two genes were tightly linked, meaning they were located close to each other on the X chromosome.

4. **Determine the Recombination Frequency**:
- Morgan observed that the recombination frequency for these tightly linked genes was very low. Specifically, he found that the percentage of recombination was only 1.3%. This indicates that most offspring will display parental traits rather than recombinant traits.

5. **Conclude the Answer**:
- Therefore, the answer to the question is that the genes for white eye and yellow body in Drosophila showed **1.3% recombination**.

### Final Answer:
The genes white eye and yellow body in Drosophila showed **1.3% recombination**.

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