The genetic basis for cancer was suspected long before the scientific evidence was uncovered.The suspicion was due to

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All of these options are correct and have contributed to the suspicion that there is a genetic basis for cancer. Tumor cells being clonally inherited suggests that there is a genetic mutation that leads to the cancerous properties. Mutagenic chemicals and ionizing radiation can damage DNA, which can also lead to the development of cancer. The tendency for certain forms of cancer to run in families suggests that there may be genetic predispositions to developing cancer. Chromosomal arrangements have also been associated with certain cancers, suggesting that genetics play a role in their development.

The Genetic Basis for Cancer Was Suspected Long Before the Scientific