Question

what is the relationship between genes and alleles?

Answer 1

this comes down to a matter of perspective.

An allelle is a heritable unit whose existence can be deduced throught genetic breeding experimentation.

A gene is the subunit of DNA that codes for a single protein.
genes are discovered and described directy through the application of molecular biology techniques and DNA sequence analysis.

A chromosome is a large strand of superclustered eukaryotic DNA that is the primary location of genetic information in a eukaryotic organism. Chromosomes contain genes. Chromosomes also contain structural and regulatory elements in addition to genes.