What cross is called monohybrid?

Crossbreeding is called monohybrid, in which the parent forms differ from each other in one pair of contrasting, alternative characters.
Examples of monohybrid crosses are experiments conducted by Gregor Mendel: crosses of pea plants that differ from each other in one pair of alternative traits: yellow and green color, smooth and wrinkled surface of the seeds (the first law of Mendel is the uniformity of hybrids of the first generation).

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