Final answer:
Combination coding refers to using a single code that can fully report specific conditions, such as the 64 possible combinations generated by the three-nucleotide structure of DNA coding for 20 amino acids.
Step-by-step explanation:
Combination coding means one code may be assigned to fully report the conditions. In the context of genetics, for instance, the three-nucleotide code in DNA results in 64 possible combinations (4³, with four different nucleotides possible at each of the three positions within the codon). This comprehensive coding system allows each codon to represent one amino acid, and with only 20 amino acids to encode, this means there are more codons than necessary, which is known as the redundancy of the genetic code.