NEET2012ZoologyPrinciples of Inheritance and VariationActual
A test cross is carried out to
Options
- Adetermine the genotype of a plant at F ₂
- Bpredict whether two traits are linked
- Cassess the number of alleles of a gene
- Ddetermine whether two species or varieties will breed successfully
Correct answer
A. determine the genotype of a plant at F ₂
Step-by-step solution
When F ₁ hybrid is crossed with its recessive parent, it is called test cross. By test cross heterozygosity and homozygosity of the organism can be tested. It gives 1: 1 ratio in monohybrid and 1: 1: 1: 1 ratio in dihybrid condition. In presence of linkage the ratio varies from this.