Which viral vectors are more commonly used when stable integration into the genome is required for treatment? O 1. Adenoviruses
2. Adeno associated viruses
O 3. Lentiviruses
O 4. Retroviruses

Which statement best describes the relationship between an allele and a gene? question 1 a. an allele is a variation of a gene that can be expressed as a phenotype. b. an allele is the part of a gene that attaches to messenger rna molecules. c. an allele is a segment of a dna molecule that controls replication of a gene.