The Phenotypic ratio in a monohybrid cross between two heterozygous parents is 3:1.
In biology, a monohybrid cross is a cross between two organisms involving only one trait. Recall that genes occur in pairs called alleles, the expressed traits of individuals depends on the dominant (expressed) and recessive genes in the alleles.
Two heterozygous parents may be shown as Tt. The gene T is dominant while the gene t is recessive. We can see that three of the offspring has the dominant T gene hence they will express the trait represented by T. Only one organism will express the trait represent by t. Therefore, the phenotypic ratio is 3:1.
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