Answer the following question given this paragraph: 

Chromosome, gene, locus and alleles are all related. What is the different between a gene and a locus? Between a gene and an allele? Chromosomes are composed of genes located at specific loci. And genes have different alleles. If genes did not have different alleles, we would genetically be all the same. What does that mean?.


Q: We would genetically be all the same if genes did not have different what?

 Choices:

- atoms

- antigens

- bases

- alleles

A:
alleles
