41.   Some of the women who die young, particularly in families with many cases of breast cancer, may have carried a gene that predisposed them to the disease.

42.   Some of the problems involved damage to the chromosomes, the rod-shaped bodies in the cell nucleus that carry the genes.

43.   Some insects, in turn, carry genes that protect them from the toxin.

44.   Such cells carry their genes on chromosomes, which are long strands of DNA.

45.   Tests will be conducted to determine whether Clayton-Neiderman carries the gene for breast cancer.

46.   Students carrying the gene for the neurochemical receptor that governs risk-taking were instead identified as carrying the alcoholism gene, complained one distraught father in Palo Alto, Calif.

47.   The birds that emerged were chimeric, carrying the gene in some, but not all, of their cells.

48.   The bacterium also contains two small rings of DNA known as plasmids, which carry the genes essential for its virulence.

49.   The birds carry genes that make their eggs contain proteins that can treat disease.

50.   The anthrax genome consists of a single large chromosome and two small circles of DNA, called plasmids, that carry extra genes.