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Which of the following statements accurately characterizes the relationship between genes and chromosomes?

A Each chromosome contains multiple genes.

Each chromosome contains many genes, which is the basic unit of heredity. Each gene is coded by a number of DNA base pairs; the average gene contains twenty-seven thousand base pairs. A human chromosome is a single strand of DNA, which is usually tightly coiled. Human chromosomes average more than sixty million base pairs; each human chromosome contains, on average, about seven hundred genes (though some chromosomes contain more than others).