Answer:
Some traits that are inherited may not express themselves. Such hidden traits are known as recessive traits. Mendel explained this phenomenon with the help of monohybrid cross. In a monohybrid cross performed by Mendel, tall plant was crossed with a dwarf plant which produced all tall plants in \[{{F}_{1}}\] progeny.
However, when these \[{{F}_{1}}\] tall plants were crossed with each other, both tall and dwarf pea plants were obtained in \[{{F}_{2}}\] generation. Reappearance of the dwarf pea plants in \[{{F}_{2}}\] generation proves that the dwarf trait was inherited but not expressed in \[{{F}_{1}}\] generation.
\[\begin{matrix} \text{Parent}\,\,\,\,\,\,\,\,\,\,\,\, & \text{Tall (TT)} & \times & \text{dwarf (tt)} \\ {{F}_{1}}\,\text{genertion} & \text{Tt} & \begin{align} & \,\,\,\,\,\downarrow \\ & \text{selfing} \\ \end{align} & \text{Tt} \\ {{F}_{2}}\,\text{generation} & \text{TT} & \text{Tt}\,\,\,\,\text{Tt} & \text{tt} \\ \end{matrix}\]
So, dwarfness traits of plants (pea plant) were not lost but are suppressed in the \[{{F}_{1}}\] generation and thus reappears in \[{{F}_{2}}\] generation.
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