Which option shows all allele combinations that can be used to represent a purebred animal

To represent a purebred animal, we need to list all the possible allele combinations in which both alleles are the same.

Let's use the letter "A" to represent one specific allele. Here are the possible combinations for a purebred animal:

1. AA (both alleles are A)
2. BB (both alleles are B)
3. CC (both alleles are C)
4. DD (both alleles are D)
5. EE (both alleles are E)

These combinations illustrate that a purebred animal will have two identical alleles for a specific trait or gene.