The Tt plant is heterozygous for genes controlling one character (height), it is a monohybrid and the cross between TT and tt is a monohybrid cross.
Which cross is called a monohybrid cross?
Correct answer: D — RR × tt
A cross involving one character (one gene) is a monohybrid cross; RR × tt is the analogous example to TT × tt described in the notes.
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