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Test cross involves
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- crossing between two F1 hybrids
- crossing the F1 hybrid with a double recessive genotype
- crossing between two genotypes with dominant trait
- crossing between two genotypes with recessive trait
Correct Option: B
A cross of F1 hybrid with its recessive homozygous parent is called the test cross. It is done to determine the genotype of a given plant. If the given plant has homozygous dominant traits then on test cross it gives all dominant trait plants but if it is heterozygous dominant than it gives dominant and recessive phenotypes in 1: 1 ratio.
