| dyad | A pair. Two units. Half of a tetrad (four units). What happens to bivalent (tetrad) chromosomes after the first nuclear division of meiosis. (09 Oct 1997) |
|---|---|
| dyad symmetry element | Dyad symmetry element bound by serum response factor to control the expression of c fos. (18 Nov 1997) |
| dyad symmetry of DNA | <molecular biology> Two areas of a DNA molecule whose base pair sequences are repeats of each other, inverted relative to each other, or are palindromes. (09 Oct 1997) |