What term describes the finished HGP reference assembled from several donors? It is a mosaic.
A mosaic is a patchwork assembled from different pieces. The Human Genome Project reference is called a mosaic because scientists combined sequence information from multiple anonymous donors rather than sequencing one person from beginning to end.
The term does not mean that the reference genome represents a person whose cells naturally contain several unrelated genomes. Instead, it describes how the scientific reference was constructed. Different chromosome regions and DNA libraries contributed to the assembled sequence, with one public library providing most of the sequence but not all of it.
This is different from a haplotype, which is a set of genetic variants inherited together, and from a clone, which is a genetically copied cell or organism. A pedigree records family relationships; it is not a sequence assembly. Modern reference genomes continue to be improved as researchers add diversity and close gaps.