Alleles are alternate versions of gene(s) that have nucleotide sequences.

They are the same genes, but have slightly different nucelotide sequences. These might or might not be mutations, but they still allow for the characteristic to be coded and expressed. This shows the diversity in the range of ways that a gene can be expressed.

Rna polymeras should attache to the promoter.

The answer is going to be a because ik that i’m right