Question

Test cross involves :

• A. Crossing between two genotypes with recessive trait
• B. Crossing between two $F_1$ hybrids
• C. Crossing the $F_1$ hybrid with a double recessive genotype
• D. Crossing between two genotypes with dominant trait

Answer 1

The correct option is C Crossing the $F_1$ hybrid with a double recessive genotype

A test cross is a way to explore the genotype of an organism. Early use of the test cross was as an experimental mating test used to determine what alleles are present in the genotype.
It involves the crossing of an organism with an unknown dominant genotype with an organism that is homozygous recessive for that trait.