7 selective chromatid segregation phenomenon that operates during mouse cells mitosis [24]; the generation of bilaterally symmetrical neurons in the C. elegans worm by injecting mutant tubulin message into the one-celled embryo [63,64]; human mirror hand movement disorder development owing to rad51/RAD51 heterozygosity [65]; and the two-coloured wing-spots pigmentation development of the Bruchus beetle's Piebald gene mutant [66]. The gene discussed is RAD51; the disease is movement disorder.