A cow with red coat is crossed with a bull having white coat. Their offspring produced in `F_(1)` generation showed roan coat. This effect is produced due to juxtaposition of small patches of red and white colour. What can be assumed about the gene controlling coat colour in cattle ?

Options

A. The alleles of gene controlling coat colour show a perfect

dominant recessive relationship
B. The alleles of gene controlling coat colour are imcompletely dominant
C. The alleles of gene controlling coat colour are codominant
D. none of these

Answer

To solve the question regarding the coat color inheritance in cattle, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Parent Genotypes:**
- The cow has a red coat, which we can denote as homozygous (RR).
- The bull has a white coat, which we can denote as homozygous (WW).

2. **Cross the Parents:**
- When we cross the red-coated cow (RR) with the white-coated bull (WW), the offspring in the F1 generation will inherit one allele from each parent.

3. **Determine the F1 Generation Genotype:**
- The offspring will have the genotype RW (one red allele and one white allele).

4. **Phenotype of the F1 Generation:**
- The F1 generation shows a roan coat, characterized by patches of both red and white colors. This indicates that both alleles are expressed in the phenotype.

5. **Analyze the Expression of Alleles:**
- The presence of both red and white patches suggests that neither allele is completely dominant over the other. Instead, both alleles are expressed simultaneously.

6. **Conclusion about the Gene Interaction:**
- Since both red and white colors are visible in the roan coat, we can conclude that the alleles for coat color in cattle exhibit **co-dominance**.

### Final Answer:
The alleles of the gene controlling coat color in cattle are co-dominant.

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