Read the information below about the test conducted by Bay Medical Company. Then, answer the question below. The test: As you read in Dr. Sattari's message, genetic researchers at Bay Medical Company have identified two gene versions for running ability: A1 and A2. A1 instructs for the ACTN3 protein. Researchers tested three runners to see what proteins they had in their cells.

Evidence: For the running ability feature, runner 1 had only ACTN3 proteins in her cells.

Based on the proteins that were found in runner 1’s cells, what can you say about her genes? Explain your ideas using the following words: gene versions, heterozygous, and hom0zygous.