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What is the smallest unit of heredity?

  • A.chromosome
  • B.gene
  • C.codon
  • D.nucleotide

Answer: B

Correct answer: gene

A gene is the smallest unit of heredity - the stretch of DNA that specifies one product and is inherited as a unit. A chromosome carries many genes; a codon is three bases within one; a nucleotide is a single chemical building block and carries no heritable information alone.

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