Principles of Inheritance and Variation Question 32
32. A test cross is carried out to
[2012M]
(a) determine the genotype of a plant at F2.
(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.
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Answer : a
Hints & Solution
(a) A test cross, first introduced by Gregor Mendel, is used to determine if an individual exhibiting a dominant trait is homozygous or heterozygous for that trait. It takes place between an individual with unknown genotype and recessive parent.
