Our long and winding road to understanding ‘The Gene’

The field of genetics has seen exponential growth in recent years, and today may be on the verge of further breakthroughs that will radically change the way we function as a species. But to understand genetics now, one must first understand its complex past dating back to the 19th century, a past chronicled in Dr. Siddhartha Mukherjee’s new book “The Gene.” Mukherjee joins Judy Woodruff for more.