Showing results for "Silverman" in Anatomy & Physiology

What color is your hair? Human hair color ranges from white and light blond to black. Red is the least common hair color. What determines the color and texture of your hair? Listen to this book to find out about how your genes affect your physical features.

Can you stretch your thumb back to your arm? Is your pinkie straight or slightly bent? What determines the way your joints bend - or don't bend? Listen to this book to find out about how your genes affect your physical features.

Can you roll your tongue into a U-shape? Some people can. But other people's tongues stay flat. What determines whether you can roll your tongue?