What is the difference between a proto-oncogene and an oncogene? Group of answer choices 1. These are two categories of genes. Proto-oncogenes are genes that fight cancer, oncogenes are genes that cause cancer. 2. Proto-oncogenes are naturally occurring genes in the human genome, while oncogenes come from viruses that cause cancer. 3. These are alleles of the same gene. Proto-oncogenes are wildtype alleles, and oncogenes are cancer-causing alleles.

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