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Question: Answered & Verified by Expert
A test cross is carried out to
BiologyPrinciples of Inheritance and VariationNEETNEET 2012 (Mains)
Options:
  • A determine the genotype of a plant at $\mathrm{F}_2$
  • B predict whether two traits are linked
  • C assess the number of alleles of a gene
  • D determine whether two species or varieties will breed successfully
Solution:
1753 Upvotes Verified Answer
The correct answer is: determine the genotype of a plant at $\mathrm{F}_2$
When $\mathrm{F}_1$ 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.

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