Test cross in plants or in Drosophila involves crossing:
between two genotypes with dominant trait
between two genotypes with recessive trait
between two F1 hybrids
the F1 hybrid with a double recessive genotype
, a test cross is a method devised by Mendel to determine the genotype of an organism showing a dominant phenotype. In a typical test cross, the organism (often an F1 hybrid or an F2 plant with a dominant trait) is crossed with the recessive parent (double recessive genotype) instead of self-crossing. This allows the phenotype of the offspring to reveal the genotype of the parent in question .
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