Which organism is mentioned as being successfully combined with human DNA?

The organism successfully combined with human DNA is yeast. Yeast, particularly the species Saccharomyces cerevisiae, is often used in genetic engineering and biotechnology due to its relatively simple genome and ability to undergo genetic modifications effectively. By inserting human genes into yeast, researchers can study the function of these genes, produce human proteins, and even use yeast as a platform for therapeutic applications, such as vaccine development or the production of pharmaceuticals.

Yeast's eukaryotic nature, similar to human cells, allows it to properly process and express human genes in a way that prokaryotic organisms, like bacteria, cannot. This makes yeast a valuable model organism for understanding human biology and for developing treatments for various diseases.

The other organisms, while important in their own contexts, either do not have the same level of compatibility with human DNA or are less frequently used for direct genetic manipulation involving human genes.