Selective breeding is not a new thing in the food world; humans have been selecting for desirable traits in plants and animals for thousands of years. But it is getting more sophisticated. This week on the Local Food Report, Elspeth Hay talks with a Wellfleet oysterman who's growing oysters with three sets of chromosomes instead of the normal two.

You can read more about "triploid" oysters on Elspeth's blog, Diary of a Locavore.