Drosophila with `y^(+)w//y w` genotype has

Options

A. brown body , red eyes
B. Yellow body , red eyes
C. Yellow body , white eyes
D. brown body , white eyes

Answer

To solve the question regarding the Drosophila with the genotype `y^(+)w//y w`, we need to analyze the components of the genotype and understand what traits they represent.

### Step-by-Step Solution:

1. **Identify the Genotype**: The genotype given is `y^(+)w//y w`. This indicates that there are two alleles for each gene: one from each parent. The `y^(+)` represents the wild type allele for the body color gene, while `y` represents the yellow body color allele. The `w` represents the white eye allele, and the second `w` also represents the white eye allele.

2. **Determine the Traits**:
- **Body Color**:
- The `y^(+)` allele is the wild type, which corresponds to a brown body color in Drosophila.
- The `y` allele corresponds to a yellow body color.
- Since `y^(+)` is dominant over `y`, the presence of `y^(+)` means that the body color will be brown.

3. **Eye Color**:
- The `w` allele represents white eyes, and since both alleles in this case are `w`, the phenotype will be white eyes.
- There is no dominant allele for red eyes present in this genotype.

4. **Conclusion**:
- The Drosophila with the genotype `y^(+)w//y w` will have a brown body color (due to the presence of the dominant `y^(+)` allele) and white eyes (due to the presence of the `w` alleles).

### Final Answer:
The Drosophila with the genotype `y^(+)w//y w` has a **brown body color and white eyes**.