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gene definition in biology, 2 examples, and 1 sentence using it

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Definition:
A gene is a segment of DNA that contains the instructions for making a functional product (usually a protein or a functional RNA) plus the regulatory sequences that control when and where that product is made.

Two examples:
- BRCA1 — a human gene involved in DNA repair; certain mutations increase the risk of breast and ovarian cancer.
- lacZ — a bacterial gene that encodes the enzyme β-galactosidase, commonly used as a reporter in molecular biology.

One sentence using the word:
Mutations in the CFTR gene cause cystic fibrosis.