| Term | Definition |
| genes | genomes that are organized into units carrying hereditary info in the form of DNA |
| chromatin | material consisting of DNA and associated proteins |
| chromosomes | carriers of genetic info in eukaryotic cells; sometimes have an "X" shape |
| cell cycle | cycle of dividing eukaryotic cells which consists of mitosis, cytokinesis, and stages of interphase |
| interphase | process in which chromosomes become duplicated and cells carry on with their normal activities |
| mitosis | nuclear division that produces two nuclei identical to the parent nucleus |
| cytokinesis | division of the cytoplasm to yield tow daughter cells |
| chromatids | pair of chromosomes that contain identical strands of DNA sequences; one side of a chromosome |
| centromere | constricted region inside a chromosome that hold the two chromatids together |
| mitotic spindle | protein fiber which seperate chromosomes during anaphase |
| gametes | sex cells |
| zygote | a union of two sex cells (sperm and egg) |
| diploid | having TWO sets of chromosomes |
| haploid | having ONE set of chromosomes |
| homologous chromosomes | chromosomes that are similar in their genetic makeup |
| autosomes | chromosomes other than a sex chromosome (X & Y) |
| binary fission | an equal division of a cell into TWO daughter cells; type of asexual reproduction |
| cancer | a disease where cells invade and destroy tissues and organs in an organism |
| sex chromosomes | chromosomes that determine the gender of an organism (X & Y) |