Select the correct option for the Hardy-Weinberg principle.

  • A
    $(p+q)^{3} = 1$
  • B
    $p^{2} + pq + q^{2} = 1$
  • C
    $p^{2} + 2pq + q = 1$
  • D
    $p^{2} + 2pq + q^{2} = 1$

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