A gene is said to be dominant, if

  • [AIPMT 1992]
  • [AIPMT 2002]
  • A

    It is never expressed in any condition

  • B

    It is expressed only in heterozygous condition

  • C

    It expresses its effect only in homozygous stage

  • D

    It is expressed both in homozygous and heterozygous conditions

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During replication of a bacterial chromosome $DNA$ synthesis starts from a replication origin site and

  • [AIPMT 2004]