The Mendel dihybrid phenotypic ratio is . . . . . . .

  • A
    $1$ : $3$ : $3$ : $9$
  • B
    $3$ : $9$ : $1$ : $3$
  • C
    $9$ : $3$ : $3$ : $1$
  • D
    $6$ : $3$ : $3$ : $4$

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