Turning genes on and off

This exercise is a part of Educator Guide: Woolly Mammoth DNA and A New Element / View Guide
The pelt of a 52,000 year-old woolly mammoth complete with reddish-brown fur is being measured and photographed with a smart phone by two men. The man on the left wears a black baseball cap and an olive green jacket. He is holding a yellow tape measure. The man on the right has a white beard and glasses and is wearing a long-sleeved light blue shirt. He holds the phone in a gloved hand.
Skin from a mammoth that died 52,000 years ago was so well-preserved that even the 3-D structure of...