The normal structural configuration of DNA consisting of two helices winding about the same axis. The structure of DNA first proposed by Watson and Crick with two interlocking helices joined by hydrogen bonds between paired bases. The condition in polyploids in which a heterozygous individual produces homozygous gametes . Encodes male and female specific proteins produced by differential splicing of the primary transcript in each sex. An identical locus mapping to a second site in a genome .
Duplications supply genetic material capable of evolving new functions.
A pair of sister chromatids joined at the centromere, as in mitosis and meiosis .