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A test cross is carried out to
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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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