The term that refers to the complete set of genetic information within an organism is the genome.

To clarify the options:
- Phenotype refers to the observable physical or biochemical characteristics of an organism, which result from the interaction of its genotype with the environment.
- Genotype refers to the specific set of genes or alleles that an organism possesses. It is a part of the genetic makeup but does not encompass the entire genetic information.
- An allele is one of the different forms of a gene found at a specific locus.
- The genome is the entire collection of an organism’s genetic material, including all of its genes and non-coding sequences. This includes both the nuclear DNA and, in some organisms, mitochondrial DNA.

Therefore, the correct answer should be Genome as it represents the full genetic blueprint of an organism.

Reference: Genetics: From Genes to Genomes, 6th Edition, Chapter 2, page 45