Benchmark 5B
The Living Environment: Heredity
Grades 9-12, page 108

The information passed from parents to offspring is coded in DNA molecules.

NSES Content Standard C 
Life Science: Reproduction and heredity
Grades 5-8, page 157
Hereditary information is contained in genes, located in the chromosomes of each cell. Each gene carries a single unit of information. An inherited trait of an individual can be determined by one or many genes, and a single gene can influence more than one trait. A human cell contains many thousands of different genes.

NSES Content Standard C 
Life Science: The molecular basis of heredity
Grades 9-12, page 185
In all organisms, the instructions for specifying the characteristics of the organism are carried in DNA, a large polymer formed from subunits of four kinds (A,G,C, and T). The chemical and structural properties of DNA explain how the genetic information that underlies heredity is both encoded in genes (as a string of molecular "letters") and replicated (by a templating mechanism). Each DNA molecule in a cell forms a single chromosome.