Test cross involves

  • [AIPMT 2006]
  • A

    crossing between two genotypes with dominant trait

  • B

    crossing between two genotypes with recessive trait

  • C

    crossing between two $F_1$ hybrids

  • D

    crossing the $F_1$ hybrid with a double recessive genotype.

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Test cross is

$A$ : Mendel gave postulates like "principles of segregation and principles of independent assortment" after studying seven pairs of contrasting traits in garden pea.
$R$ : He was lucky in selecting seven characters in pea that were located on seven different chromosomes