Part of the answer is in our genes. A gene is a basic unit of heredity ... G and T — that code for proteins. Differences between species come from the order and length of those DNA sequences.

Genetics can play a role in a person's odds for Alzheimer's disease, and new research suggests differences in that risk are based on which parent had the illness. In a study of 4,400 people still ...

Genes are segments of DNA (deoxyribonucleic acid) that are located inside every human cell. The DNA inside each cell is tightly coiled in structures called chromosomes. Each chromosome contains a ...