Listen Now Download as mp3 from the show Hacking biology - synthetic DNA and experimental evolution
Our gene of the month is Ken and Barbie - yes, named after the dolls. Like their plastic childhood counterparts, male and female flies with a fault in the gene have no external genitals - their naughty bits start to develop but get stuck inside the body.
The Ken and Barbie gene itself encodes the instructions to make a transcriptional repressor - a protein that prevents genes being switched on. Ken - as itís usually known - sits on genes involved in making a flyís genitals and keeps them switched off until the precise moment theyíre needed.
Luckily for us, thereís no human equivalent of Ken and Barbie, although itís distantly related to a gene called Bcl6, which is involved in lymphoma.