Q106 / 120 · NEET 2012 (Mains) · Zoology

A test cross is carried out to

Correct answer
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

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.

Hence, the correct answer is option: 'A'.

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