Crossing the F1 hybrid with a double recessive genotype
A
Crossing between 2 genotypes with dominant trait
B
Crossing between 2 genotypes with recessive trait
C
Crossing between 2 F1 hybrids
D
Crossing the F1 hybrid with a double recessive genotype
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Solution
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A test cross is a fundamental tool devised by Gregor Mendel. A test cross is an experimental cross of an individual organism of dominant phenotype but unknown genotype and an organism with a homozygous recessive genotype (and phenotype).
So, the correct answer is 'Crossing the F1 hybrid with a double recessive genotype
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