bioethics: The study of questions of right and wrong that arise from the new biotechnologies.

chromosomes: Threadlike structures—in the nucleus of cells—that carry genetic information.

clone: A genetic duplicate of a living thing.

cystic fibrosis: A genetic disease that causes thick mucus to form and makes breathing difficult.

despotic: Tyrannical; ruling with absolute authority.

differentiation: In cells, the process of changing from the kind of cell that can develop into any part of the body to a cell of one specific kind.

DNA: Deoxyribonucleic acid, which is the name of the chemical from which a cell's genetic material is made.

embryo: The earliest stage in the development of a person or animal.

eugenics: The idea of improving the human race through the control or manipulation of genes.

genes: Sets of instructions made up of DNA. They tell the cell what to do and determine...