Question

Test cross involves

• 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.

Answer 1

Answer: (D)

The cross between $F_{1}$ hybrid and the recessive homozygous parent is called test cross. Test cross helps in identifying the genotype of an organism. Test cross helps in verifying the laws of inheritance. Test cross is also used to introduce useful recessive trait in the hybrids in rapid crop improvement programmes. Test cross is an easier and faster way for improving the variety of a crop. Test cross is of great help in the production of pure line varieties.