Practice question
Question
An E.coli mutant constitutive for the lac operon was mated with a wild type strain. The merodiploid thus obtained was inducible by lactose. This observation indicates that the original mutation is
Explanation
Understanding DNA replication fidelity reveals polymerase proofreading and origin firing ensure accurate duplication. Therefore recessive is correct because it matches high-fidelity synthesis mechanisms, which underpins key processes in molecular biology.
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