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//yw`, we need to analyze the traits associated with the given alleles.

### Step-by-Step Solution:

1. **Identify the Genes and Their Alleles**:
- The genotype `y^(+)w//yw` indicates two traits:
- The first trait is for body color, represented by the `Y` gene.
- The second trait is for eye color, represented by the `W` gene.

2. **Determine the Dominance of the Alleles**:
- For the `W` gene:
- `W^+` (wild type) is dominant and codes for red eye color.
- `w` (mutant) is recessive and codes for white eye color.
- For the `Y` gene:
- `Y^+` (wild type) is dominant and codes for brown body color.
- `y` (mutant) is recessive and codes for yellow body color.

3. **Analyze the Genotype**:
- The given genotype `y^(+)w//yw` can be interpreted as:
- One allele from one parent is `Y^+` (brown body) and `w` (white eyes).
- The other allele from the second parent is `y` (yellow body) and `W` (red eyes).
- Therefore, the possible combinations are:
- `Y^+w` (brown body, white eyes)
- `yw` (yellow body, white eyes)

4. **Determine the Phenotype**:
- For the eye color:
- Since one allele is `w` (white), and the other is `W^+` (red), the phenotype will be determined by the dominant allele, which is `W^+`. Therefore, the eye color will be white.
- For the body color:
- The presence of `Y^+` (brown) will dominate over `y` (yellow), so the body color will be brown.

5. **Conclusion**:
- The Drosophila with the genotype `y^(+)w//yw` will exhibit a phenotype of brown body color and white eye color.

### Final Answer:
The Drosophila with `y^(+)w//yw` genotype has brown body color and white eye color.