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Gene and cistron words are sometimes used synonymously because

1. one cistron contains many genes
2. one gene contains many cistrons
3. one gene contains one cistron
4. one gene contains no cistron

Correct answer: one gene contains one cistron

Solution

A cistron is an older term for a functional unit of heredity, essentially equivalent to a gene in many textbook contexts. That is why the two words are sometimes used synonymously: one gene corresponds to one cistron.

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