Final answer:
A recessive tumor phenotype refers to a trait that is expressed only when an individual has two copies of a particular gene variant.
In the context of fused cells forming a tumor, the recessive tumor phenotype is observed when both cells carry the recessive gene variant.
Step-by-step explanation:
In the context of tumor phenotypes, a recessive tumor phenotype refers to a trait that is expressed only when an individual has two copies of a particular gene variant.
When two cells fuse together, the resulting tumor will exhibit the recessive phenotype if both cells carry the recessive gene variant.
Therefore, the recessive tumor phenotype is the result of mutations in two different cells that merge to form a single tumor.