| Term | Definition |
| interphase | phase before mitosis; growth of cell and preparation for division |
| prophase | chromatin condenses into chromosomes, nuclear envelope disappears, spindle fibers start to form |
| G1 | growth and functioning |
| Synthesis | DNA replicates |
| G2 | organelles replicate in preparation for division |
| metaphase | chromosomes, chromosomes line up in the middle of the cell |
| anaphase | the sister chromatids seperate into individual chromosomes and are moved apart |
| telophase | chromosomes return to chromatin; nuclear membranes form; cleavage furrow begins |
| cytokinesis | splitting of the cytoplasm |
| mitosis | splitting of the nucleus |
| sister chromatids | Replicated forms of a chromosome joined together by the centromere and eventually separated |
| centromere | area connecting sister chromatids |
| spindle fibers | microtubules that extend from the centrioles and guide chromosome movement |
| nucleus | organelle that initiates cell division |
| somatic cell | all human body cells; not the gametes |
| diploid | having two sets of chromosomes; all somatic cells |
| haploid | having one set of chromosomes; the gametes |
| gamete | sex cell; egg or sperm |
| zygote | fertilized egg |
| sexual | reproduction combining genetic info from two parents |
| asexual | reproduction by one parent as a result of cell division |
| cell plate | forms in plant cells to form new cell membrane and cell wall |
| meiosis | cell division producing gametes |
| variation | differences in members of a population |
| homologous pair | each of the 23 pairs of human chromosomes |