Answer:
A gene is a fragment of DNA, the allele is a possible variation of a gene.
Step-by-step explanation:
Genes contain hereditary information, that codes this information for the transmission of inherited traits.
Each gene resides at a specific location on a chromosome, in two copies, one inherited from each parent.
These copies are not necessarily the same.
When the copies of a gene differe from each other, they are called alleles.
Even genes may have multiple alleles, only two alleles are present at the gene's locus on any individual.
I hope it helps!