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The genotypes of a plant variety were TtHh, Tthh, ttHh and tthh, where T = tallness and H = hairy stem. Which one of the following crosses would produce progeny giving a phenotypic ratio approximately 1: 1: 1: 1?
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The correct answer is:
TtHh × tthh
This is a dihybrid test cross which produces the ratio of 1 : 1 : 1 : 1.
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