I gave my DNA away. Can I get it back?

Testtube with DNA strands in backgroundImage copyrightGetty Images
Image caption More and more people are doing DIY DNA tests

I recently spat in a pot and sent my saliva off in an envelope for analysis.

A growing number of people are willingly handing over their DNA to corporations in return for learning about their ancestry or to get health reports.

Why are we prepared to make this trade with our most intimate of data and what are we getting in return?

And what happens if you want your data back?

Interest in off-the-shelf DNA tests has exploded in recent years.