What is different between two alleles of the same gene?
◦ Their base sequence. For example, one allele might have the base sequence AGGTCTGA while the other has the base sequence GGTCTGT.
◦ Their location. For example, one allele might be at the end of one chromosome while the other allele is in the middle of another chromosome.
◦ The chromosome number they are on. For example, one allele might be on chromosome 12 while the other one is on chromosome 3.
◦ The cell they are in. For example, one might be in a liver cell while the other is in a blood cell.