The option that shows all allele combinations that can be used to represent a purebred animal is:
TT or tt
A purebred animal has two identical alleles for a trait, which can either be homozygous dominant (TT) or homozygous recessive (tt). The options "TT or Tt" and "Tt" include a heterozygous combination (Tt), which is not purebred. The option with "tt" alone does not represent all combinations. Therefore, the correct answer is "TT or tt."
1 answer