| Term | Definition |
| Mitosis | division of cytoplasm |
| Meiosis | type of cell division that produces four cells |
| Chromosomes | shorter and thicker chromatin |
| Homologous Chromosomes | two chromosomes of each matching pair |
| Chromatin | long, thin fibers |
| Chromatids | each of the two threadlike strands into which a chromosome divides during cell division |
| Centromere | middle point where sister chromatids are connected |
| Sister chromatids | two copes of each chromosome |
| Centriols | a minute cylindrical organelle near nucleus (in animal cells) |
| Centrosomes | organelle near nucleus of a cell that contains centrioles in animal cells |
| Genes | distinct sequence of nucleotides forming part of a chromosome |
| Diploid | cells with 2 homologous sets of chromosomes |
| Haploid | cells that contain 1 set of chromosomes |