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4.Principles of Inheritance and Variation
medium
A test cross is carried out to
A
determine the genotype of a plant at $F_2$
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.
(AIPMT-2012)
Solution
(a) : Test cross is performed to determine the genotype of $F_2$ plant. In a typical test cross an organism showing dominant phenotype and whose genotype is to bedetermined is crossed with one that is homozygous recessive for the allele being investigated, instead of selfcrossing. The progenies of such a cross can easily be analysed to predict the genotype of the test organism. Given ahead is an illustration of test cross:
Standard 12
Biology
