Genes and genomes

It's now over a decade since the human genome was first sequenced, costing over a billion pounds and taking 13 years. Today, we're close to the thousand dollar genome. But what's in a genome, and what can it tell us about our risk of disease? Plus we'll be arguing the age of polar bears, and finding out about fish with skin cancer. And our gene of the month is one for the Trekkies out there - it's Tribbles.