What map unit (Centimorgan) is adopted in the construction of genetic maps?

  • A
    $A$ unit of distance between two expressed genes,representing $10 \%$ cross over
  • B
    $A$ unit of distance between two expressed genes,representing $100 \%$ cross over
  • C
    $A$ unit of distance between genes on chromosomes,representing $1 \%$ cross over
  • D
    $A$ unit of distance between genes on chromosomes,representing $50 \%$ cross over

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