Define $F_{1}$ and $F_{2}$ generations.

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Solution

$F_{1}$ Generation. $F_{1}$ or first filial generation is the generation of hybrids produced from a cross between the genetically different individuals called parents. For example, Tt individuals are produced in $F_{1}$ generation from a cross between TT and tt parents.
$F_{2}$ Generation. $F_{2}$ second filial generation is the generation of individuals which arises as a result of inbreeding of interbreeding amongst individuals of $F_{1}$ generation.

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