Dominance is not an autonomous feature of a gene in case more than one phenotype is influence by the same gene.

Answer

### Step-by-Step Solution:

1. **Understanding the Terms**:
- The term "autonomous" means independent. In genetics, it refers to a feature that operates independently of other factors.

2. **Defining Dominance**:
- Dominance is a genetic principle where one allele (the dominant allele) masks the expression of another allele (the recessive allele) in a heterozygous condition. This means that the phenotype associated with the dominant allele will be expressed regardless of whether the organism has one or two copies of that allele.

3. **Homozygous vs. Heterozygous Conditions**:
- In a homozygous condition (e.g., TT), the dominant phenotype is expressed.
- In a heterozygous condition (e.g., Tt), the dominant phenotype is also expressed.

4. **Example of Dominance**:
- For instance, if we consider a trait for plant height where "T" represents tall and "t" represents short:
- TT (homozygous dominant) → Tall
- Tt (heterozygous) → Tall
- tt (homozygous recessive) → Short
- Here, both TT and Tt produce the same phenotype (tall), demonstrating that dominance is an autonomous feature in this case.

5. **Phenotypic Variation**:
- The statement in the question suggests that dominance is not an autonomous feature when more than one phenotype is influenced by the same gene. This can occur in cases of incomplete dominance or codominance, where the presence of different alleles can lead to multiple phenotypes.

6. **Examples of Non-Autonomous Dominance**:
- **Incomplete Dominance**: In snapdragons, crossing red (RR) and white (rr) flowers results in pink (Rr) flowers, showing that the dominant allele does not completely mask the recessive allele.
- **ABO Blood Grouping**: The ABO blood group system is an example where multiple alleles (IA, IB, i) interact to produce different phenotypes (A, B, AB, O). Here, the dominance is not straightforward and depends on the combination of alleles present.

7. **Conclusion**:
- Therefore, the statement that "dominance is not an autonomous feature of a gene in case more than one phenotype is influenced by the same gene" is correct. It highlights that dominance can depend on the specific context of gene interactions and the resultant phenotypes.