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| Term | Definition |
|---|---|
| Chromosome | one long continuous thread of DNA that consists of numerous genes along with regulatory info. |
| Histones | each of your chromosomes is associated with this group of proteins |
| Chromatin | the loose combination of DNA and proteins |
| Chromatid | one half of a duplicated chromosome |
| Centromere | a region of the condensed chromosome that looks pinched |
| Nucleotides | the small units, or monomers, that make up DNA |
| Double helix: two strands of DNA wind around each other like a twisted ladder | two strands of DNA wind around each other like a twisted ladder |
| Base pairing rules | thymine (T) always pairs with adenine (A), and cytosine (C) always pairs with guanine (G) |
| Somatic cells | also called body cells, make up most of your body tissues and organs |
| Gametes | sex cells, ova, or eggs, in the female, and spermatozoa, or sperm cells, in the male |
| Homologous chromosomes | two chromosomes, one inherited from the mother, one from the father, that have the same length and general appearance |
| Autosomes | chromosomes that contain genes for characteristics not directly related to the sex of an organism |
| Sex chromosomes | directly control the development of sexual characteristics |