Question

Define test cross and explain its significance.

Answer 1

1. Definition of test cross : A cross between F₁ offspring and its homozygous recessive parent is called a test cross. 

2. Significance of test cross:

• Test cross can be used to find out the genotype of any plant which shows dominant characters. 
• Whether the plant is homozygous or heterozygous can be understood by performing test cross. 
• Test cross is used to introduce useful recessive traits in the hybrids of selfpollinated plants
• Test cross is quicker method to improve the variety of crop plants and thus it is useful for breeders and geneticists. 
• Test cross can be used for verifying the laws of inheritance.