Only the dominant trait (tall) appeared in the F1 generation when Mendel crossed two varieties of a character (such as short and tall in pea plants). The F1 plants had a Tt genetic makeup.
Since all of the plants in the F1 generation have the genotype Tt and have the allele for tall height, they are all tall plants (dominant allele).
When a dominant allele is present, all of the plants have tall heights because the recessive gene is not expressed. However, the following genotypes are produced in the subsequent generation when the plants of this generation are self-crossed: TT:Tt: tt in the ratio 1:2:1. As a result, 25% of the plants contain the recessive alleles for both alleles. When the recessive gene is expressed, the plant is short and has a lack of the dominant allele. In the F1 generation, the recessive allele was suppressed; however, in the F2 generation, it was expressed.
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