They hinge on analysis of the Y chromosome, which is passed unchanged from father to son.

Mitochondria, which live inside human cells but outside the nucleus, escape the shuffling of genes that occurs between generations and are passed unchanged from mother to children.

A decrease in drug metabolism means more of the original form of the drug could pass unchanged to systemic blood circulation.

Because the Y chromosome, which determines maleness, is passed unchanged from father to son, scientists can use it to determine whether two men share a common ancestor.

Only vibrant, living matter could pass unchanged through the unthinkable gulfs which lie between the planets.

The Y chromosome, which determines maleness, is passed unchanged from father to son.

His "Introduction" passed almost unchanged through six editions.

As Dr. Foster would learn, analysis of the Y chromosome, which is passed largely unchanged from father to son, might settle the matter.

The analysis by Dr. Hammer and colleagues is based on the Y chromosome, which is passed unchanged from father to son.

The Governor would like them enlarged, and said he would probably send the bill back for amendment if it were passed unchanged.