Question

How do two alles for the same gene differ?

Answer 1

Answer

The information they carry is different.

Alleles are different versions of the same gene and thus have a different nucleotide sequence.

For example, one allele might carry the information for blue eye pigment, while the other carries the information for brown eye pigment.

Answer 2

The alleles might be either dominant or recessive, and this is how they differ.