Therefore, "-karyo" indicates a relationship to the nucleus of a cell, which is the central part of a cell that contains the cell's genetic material.
For example:
* Eukaryote: An organism whose cells contain a nucleus.
* Prokaryote: An organism whose cells lack a nucleus.
* Karyotype: The complete set of chromosomes in a cell.
* Karyogamy: The fusion of two nuclei during sexual reproduction.