Genes control everything from hair color to blood sugar by telling ... Inside a cell is a long strand of the chemical DNA (deoxyribonucleic acid). A DNA sequence is a specific lineup of chemical ...

For the first time, scientists have witnessed the very moment DNA begins to unravel, revealing a necessary molecular event for DNA to be the molecule that codes all life.

Encoded within this DNA are the directions for traits as diverse as the color of a person's eyes ... each A in one strand always pairs with a T in the other strand, and each C always pairs ...

Genetic diversity occurs because certain physical characteristics, like eye color, are variable ... of two homologous DNA strands, precise breakage of each strand, equal exchange of DNA segments ...