Analysis of a patient's lung tumor reveals that all of the malignant cells in this tumor have a specific chromosomal abnormality involving a fusion event between two sets of chromosomes.This MOST likely suggests that

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The specific chromosomal abnormality involving a fusion event between two sets of chromosomes suggests that the tumor is monoclonal in origin, meaning that it originated from a single mutated cell that underwent this specific chromosomal abnormality. It does not suggest that the mutation was inherited or that a large number of normal cells simultaneously underwent the mutation, thus ruling out options A and D. The fact that all of the malignant cells in the tumor have the same chromosomal abnormality also suggests that the tumor is polyclonal. Therefore, option B can also be ruled out.

Analysis of a Patient's Lung Tumor Reveals That All of the Malignant