NEET 2012 Biology question

A test cross is carried out to

(1)determine whether two species or varieties will breed successfully
(2)determine the genotype of a plant at Correct
(3)predict whether two traits are linked
(4)assess the number of alleles of a gene

Answer: (2)

Solution

A test cross is the cross of an individual showing the dominant phenotype (genotype unknown, homozygous or heterozygous) with a homozygous recessive parent. If all progeny show the dominant trait the individual is homozygous (TT); if progeny segregate 1 : 1 it is heterozygous (Tt). Thus a test cross is carried out to

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Question ID VK-091007