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  4. The ratio in a dihybrid test cross between two individuals is given by

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Q. The ratio in a dihybrid test cross between two individuals is given by

AIIMSAIIMS 2001Principles of Inheritance and Variation

Solution:

Test cross is a cross to know the genotype of the individual. The individual is crossed with recessive parent. The dihybrid test cross ratio is 1:1:1:1. The characters under consideration are tall white and dwarf black.
Gametes of TtWw = TW, Tw, tW, tw
Gametes of ttww = tw
Thus the ratio of TtWw : Ttww : ttWw : ttww is 1 : 1 : 1 : 1.

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