| Term | Definition |
| Mitosis | The process by which the nucleus and duplicated chromosomes of a cell divide and are evenly distributed, forming two daughter nuclei. |
| Meiosis | A type of cell division that produces four cells, each with half as many chromosomes as the parent cell. |
| Chromosome | Condensed threads of genetic material formed from chromatin as a cell prepares to divide. |
| Homologous Chromosome | One of a matching pair of chromosomes, one inherited from each parent. |
| Chromatin | The combination of DNA and protein molecules, in the form of long, thin fibers, making up the genetic material in the nucleus of a eukaryotic cell. |
| Chromatid | Each of the two threadlike strands into which a chromosome divides longitudinally during cell division. Each contains a double helix of DNA. |
| Sister Chromatid | One of a pair of identical chromosomes created before a cell divides. |
| Centromere | Region where two sister chromatids are joined tightly together. |
| Centriole | Organelle near the nucleus in animal cells, occurring in pairs and involved in the development of spindle fibers in cell division. |
| Centrosome | Region of cytoplasmic material that in animal cells contains structures called centrioles. |
| Gene | The unit of inherited information in DNA. |
| Diploid | Having two homologous sets of chromosomes. |
| Haploid | Having a single set of chromosomes. |